PSEB Notes

This PSEB 7th Class Science Notes Chapter 13 Motion and Time will help you in revision during exams.

PSEB 7th Class Science Notes Chapter 13 Motion and Time

→ If an object does not change its position with respect to the objects around it and with time, then that object is called at rest.

→ If an object changes its position according to the objects around it and with time, then it is in motion.

→ The motion in a straight line of an object is called straight-line motion.

→ The motion of an object on a circular path is called circular motion.

→ If an object moves around its center position, the motion of that object is called Periodic motion.

→ If an object takes very little time to cover a short distance then the speed of the object is fast and if the object takes more time to cover the same distance then its speed is called slow.

→ The distance covered in 1 unit time is called the Speed. Its S.I. unit is meter per sec (m/s).

→ The Speed can be calculated using the following formula: ccc

→ The motion of an object moving at a speed along a straight line is called a Uniform Motion when the motion of an object moving at different speeds on a straight line is called Non-uniform Motion.

→ The motion of the hour hand of the clock, the motion of the earth around the sun, and the motion of a simple pendulum all are examples of uniform motion.

→ Nowadays we measure time with wall clocks, table clocks, wristwatches, or mobile phones. The SI unit of time in seconds.

→ Heavy mass (metal sphere) tied to a thread and hung in a fixed place or stand is called a simple pendulum.

→ The movement of a simple pendulum back and forth a point is called a recurring or oscillating motion.

→ The time taken to complete one oscillation is called the time period.

→ The number of oscillations completed in a second is called frequency. The S.I. unit of frequency is hertz.

→ A device that measures the speed of vehicles is called a Speedometer.

→ The speedometer measures the speed of vehicles in kilometers/hour.

→ An instrument used to measure the distance covered by vehicles is called an Odometer.

→ The graph illustrates the comparison of one quantity with another.

→ There are generally three types of graphs prevalent:

• Linear graph
• Bar graph
• Pie chart

→ The distance-time graph is a linear graph.

→ It represents the graph between the distance and time covered by the object.

→ The amount that is independent is represented on X-axis (horizontal axis) and the other amount which is dependent is on the Y-axis (vertical axis).

→ If an object is at rest, its distance-time graph is a straight line parallel to the X-axis.

→ Graph: If two quantities depend on each other then their representation is called a graph.

→ Speed: The distance covered by the object in the unit time interval is called the speed.

→ Uniform motion: When an object travels equal distances in equal time intervals, the motion is uniform.

→ Non-uniform motion: The motion of an object when it does not cover the same distance in equal time intervals is called non-uniform-motion.

→ Simple pendulum: A small piece of metal or stone hanging with the help of thread from a fixed point is called a simple pendulum.

→ Oscillation: When a freely hanging object moves from its center position to one extreme side and then to the other extreme side and finally reaches its previous position i.e. middle position, the object is said to complete an oscillation.

→ Time period: The time taken by a simple pendulum to complete an oscillation is called a time period.

→ Uniform speed: When an object travels equal distances in equal time intervals, no matter how small the time interval, the speed of the object is called uniform speed.

→ Non-uniform speed: When an object does not cover equal distances in equal time intervals, no matter how short the time interval, the speed of that object is called non-uniform speed.

This PSEB 7th Class Science Notes Chapter 12 Reproduction in Plants will help you in revision during exams.

PSEB 7th Class Science Notes Chapter 12 Reproduction in Plants

→ Plants reproduce in two ways Sexual reproduction and Asexual reproduction.

→ Asexual reproduction is a method of reproduction by which new plants are bom from a single parent.

→ There are different methods of asexual reproduction like reproduction by sprouting, reproduction by seeds, fragmentation.

→ In the fragmentation reproductive process, the organism is divided into equal parts which grow into two individuals.

→ During sexual reproduction, the male and female reproductive organs of plants produce male gametes and female gametes which fuse together to form zygotes. The zygote develops into a new plant.

→ Sexual reproduction occurs only in flowering plants.

→ Vegetative propagation is a method of reproduction in which new plants grow through organs like roots, stems, or leaves. In this method of reproduction, neither the genitals nor the seed participates.

→ There are also many artificial methods of reproduction in plants. These are grafting, cutting, and burring under the ground.

→ The transfer of mature pollen grains from the anther to the stigma is called pollination. They reach the stigma of the same flower or another flower.

→ Flowerless plants like moss breed through fragmentation, through yeast breed through buds, while fungi and moss breed through spores.

→ The fusion of the male gamete and the female gamete in the ovum is called fertilization.

→ After fertilization of the ovaries, the ovaries develop into fruit and the ovum develops into seeds.

→ In order to move the seeds away from the germinating plants, it is necessary to scatter the seeds so that the seeds can grow into new plants.

→ Reproduction: The ability to live beings to produce new creatures like themselves is called reproduction.

→ Asexual reproduction: A method that does not require seeds to grow new plants. A single parent is required for reproduction.

→ Sexual Reproduction: Sexual reproduction is a method to produce a new organism through the combination of male and female gametes.

→ Vegetative propagation: When a new plant is obtained from any part of the plant except seed, it is called vegetative propagation.

→ Fragmentation: The formation of a new organism by dividing the body of an animal into Two or more parts is called fragmentation.

→ Unisexual Flower: A flower that has only stamens or only pistil is called a unisexual flower.

→ Bisexual flower: A flower in which both stamens and pistil are present is called a bisexual flower.

→ Fertilization: The combination of male and female gametes is called the action of fertilization.

→ Pollination: The transfer of mature pollen from the pollen cell to the stigma is called pollination.

→ Self-pollination: Pollination in flowers, when the pollen grains land on the same flower this action is called self-pollination.

→ Cross-pollination: Pollination action in which the pollen goes from the anther of one flower to the stigma of another flower. This type of pollination is done by two flowers of the same plant or flowers of the same species.

→ Germination of seeds: Reaching the moist soil, the seeds absorb water and swell. As the embryo begins to germinate, the root sprouts sink into the soil, and the stem sprouts up into the air. The leaves come out. This process is called seed germination.

This PSEB 7th Class Science Notes Chapter 11 Transportation in Animals and Plants will help you in revision during exams.

PSEB 7th Class Science Notes Chapter 11 Transportation in Animals and Plants

→ All living things need energy for various activities and this energy is received from food.

→ The leaves need water and CO₂ to make food through photosynthesis.

→ In animals, food, oxygen, and water are delivered to every cell in the body, and waste products are transported from the cells to the body’s excretory organs.

→ The movement of substances from one place to another in an organism is called transportation.

→ The circulatory system of developed organisms consists of the heart, blood vessels, and blood, which carry oxygen, carbon dioxide, food, hormones, and enzymes from one part of the body to another.

→ The single-cell organism does not have a circulatory system.

→ Blood contains red blood cells, white blood cells, platelets, and plasma.

→ The red color of the blood is caused by a pigment called Haemoglobin.

→ The heart is a muscular organ that constantly beats like a pump for the circulation of blood.

→ The number of heartbeats per minute is called the pulse rate.

→ The arteries contain oxygenated blood and the veins contain carbon dioxide-rich blood.

→ Cells exchange nutrients, gases, and follicles between blood and tissue fluids.

→ The human excretory system consists of a pair of kidneys, a pair of ureters, a urinary bladder, and a urethra.

→ The kidney produces waste products in the form of urine, lungs in the form of carbon dioxide, and skin in the form of sweat.

→ The blood cells in the human kidneys filter the blood.

→ Dialysis is the process by which a machine removes unwanted substances and excess fluid from the blood.

→ Diffusion is a process in which a matter moves from a region of higher concentration to a region of low concentration.

→ Dispersion is the process by which a solvent passes through a semi-permeable membrane. And the movement is from low-density solution to high-density solution.

→ Single-cell organism exchanges substances in the external environment from the cell surface.

→ Photosynthesis: The process of formation of carbohydrates (food) by green plants from simple compounds such as carbon dioxide and water in the presence of chlorophyll in the presence of sunlight is called photosynthesis.

→ Dispersion: This is the process in which solvents pass through a semi-permeable membrane from a low concentration solution to a solution with a higher concentration so that the concentration of the solution on both sides becomes equal. This type of transport is for short distances. Plant roots absorb water from the soil by this process.

→ Transpiration: The vaporization of water through the leaves of plants is called transpiration.

→ Transportation: The transfer of food from the leaves to other parts of the plant is called transportation.

→ Phloem: Plant tissues that carry food from the leaves to other parts of the plant, is called Phloem.

→ Arteries: The tubes that carry oxygen-rich blood from the heart to different parts of the body, are called arteries.

→ Veins: The capillaries that carry blood from different parts of the body to the heart, are called veins.

→ Excretion: The process of expelling harmful and waste products from the body is called excretion.

→ Dialysis: The process of removing urea and other toxic substances from the kidneys of the body with the help of an artificial machine is called dialysis.

This PSEB 7th Class Science Notes Chapter 10 Respiration in Organisms will help you in revision during exams.

PSEB 7th Class Science Notes Chapter 10 Respiration in Organisms

→ Breathing is a part of the process of Respiration during which the living beings take in (inhale) oxygen and give out (exhale) carbon dioxide into the air.

→ The oxygen we take in when we breathe breaks down glucose into water and carbon dioxide and also releases the energy that is necessary for the existence of living beings.

→ During cellular respiration, glucose is broken down in the cells of an organism.

→ During Aerobic respiration, glucose is broken down in the presence of oxygen.

→ During Anaerobic respiration, the breakdown of glucose occurs in the absence of oxygen.

→ During hard physical activities such as heavy exercise, fast running, and cycling, etc, energy demand is high but oxygen to produce energy is limited so anaerobic respiration takes place.

→ The breathing rate also increases during heavy physical activity.

→ Different organs are present in different organisms for respiration.

→ Lungs expand when oxygen is inhaled and contract again when exhaled.

→ The blood contains haemoglobin which carries oxygen to different parts of the body.

→ In cows, buffaloes, dogs, cats, and other mammals, the respiratory organs are similar to the human respiratory organs and the respiratory function is similar to that of humans.

→ In earthworms, gases in the gut are exchanged through moist skin.

→ In fish, this action takes place through the gills and in insects through the respiratory tract.

→ The breakdown of glucose in plants is similar to that in other organisms.

→ The roots of plants take air from the soil.

→ The leaves have small pores or holes called stomata, through which gases are exchanged.

→ Respiration: It is a biochemical reaction in organisms that involves the oxidation of complex organic foods. This results in the formation of carbon dioxide and water and releases energy.

→ Aerobic Respiration: Respiration that occurs in the presence of oxygen is called aerobic respiration.

→ Anaerobic Respiration: Breathing that occurs in the absence of oxygen is called Anaerobic Respiration.

→ Stomata: A special type of pores are present on the top layer of leaves for the exchange of air and water vapours, called stomata.

→ Respiration: This is a simple mechanical activity in which oxygen-rich air is pulled and goes into the lungs (respiratory organs). This action is called breathing. Carbon dioxide, rich air is released into the atmosphere after respiration called exhalation. This complete process is called Respiration.

→ Breathing: The act of filling the respiratory organs (lungs) with oxygen-rich air from the atmosphere is called breathing.

→ Exhalation: An activity in which carbon dioxide-rich air is expelled out of the lungs.

→ Cellular Respiration: The process that takes place inside a cell in which energy is produced after the chemical decomposition of food is called cellular respiration.

→ Breathing rate: The number of times a person breathes in a minute is called breathing rate.

→ The average person’s breathing rate is 12 to 20 breaths per minute.

→ Gills: These blood vessels are special wing-like organs that are present in some aquatic organisms, such as fish, breathe with help of gills. The water and blood flow in opposite directions which increases the diffusion of oxygen.

This PSEB 7th Class Science Notes Chapter 9 Soil will help you in revision during exams.

PSEB 7th Class Science Notes Chapter 9 Soil

→ The top layer of the earth in which crops and plants can grow is called soil.

→ Soil is made up of broken rocks, organic matter, animals, plants, and microorganisms.

→ There are different layers of soil, which can be seen in the soil profile.

→ Soil is made up of both organic and inorganic components.

→ The dead and rotten leaves of plants or the bodies of plants, insects, or dead animals buried in the soil, animal dung, etc. combine to form organic matter called humus.

→ Soil that contains a mixture of organic and inorganic substances is very useful for crops.

→ Depending on the size of the particles, the soil is clayey, sandy, rocky, and loamy.

→ Depending on the chemical nature of the soil, the soil may be acidic, basic, or neutral.

→ Acid soils have a pH of 1 to 6.

→ Alkaline soils have a pH of 8 to 14.

→ Neutral soil has a pH of 7.

→ Ph paper is used to determine the nature of the soil.

→ Black soil contains iron salts and is good for growing cotton.

→ Soil containing sulphur is good for growing onions.

→ Different types of soil are required to grow different types of crops.

→ It takes many years for the formation of the top layer of soil.

→ Removal of topsoil due to floods, winds, storms, and mining is called Erosion.

→ By digging the soil, the animals with their feet loosen the soil and the soil, which has been loosened, gets eroded quickly by wind and water.

→ By planting trees, building check dams, planting grass on the sides of farmland, and building along sides of rivers and canals soil erosion can be prevented.

→ Soil: A mixture of rock/horizontal particles and humus is called soil.

→ Soil Profile: A vertical section through different layers of soil is called the soil profile.

→ Humus: The dead and decaying organisms present in soil are called humus.

→ Soil Moisture: Soil retains water in it, which is called soil moisture.

→ Soil erosion: The removal of the top layer of soil by water, wind, or ice is called Soil erosion.

→ Weathering: It is a method in which soil is formed by the breakdown of rocks by the action of wind, water, and climate.

This PSEB 7th Class Science Notes Chapter 8 Winds, Storms and Cyclones will help you in revision during exams.

PSEB 7th Class Science Notes Chapter 8 Winds, Storms and Cyclones

→ The air around us exerts pressure.

→ Moving air is called wind.

→ Very strong wind lowers the pressure.

→ Air expands on heating and contracts on cooling.

→ Hot air is lighter than cold air.

→ The wind moves from high-pressure areas to low-pressure areas.

→ Wind speed is measured with an Anemometer.

→ The direction of wind speed is measured by the wind vane.

→ Wind currents (movement) are caused by the uneven heating of the earth.

→ Monsoon winds are filled with moisture (water vapours) and bring rain.

→ Cyclones are destructive.

→ A cyclone crossed the coast of Orissa on October 18, 1999.

→ Cyclones have higher wind speeds.

→ A cyclone is a very strong whirlwind that revolves around very low-pressure areas.

→ A hurricane is a storm with strong winds blowing through, in a funnel-shaped cloud.

→ The loud noise produced during lightning is called thunder.

→ Heavy rain with strong winds is called a storm.

→ Hurricanes in the United States and typhoons in Japan are cyclones.

→ Tornadoes are dark cone-like clouds that form between the earth’s crust and the sky.

→ All kinds of natural disasters like cyclones, tornadoes, etc. destroy trees, wires, and communication systems.

→ Special policies are adopted during disasters.

→ A cyclone warning is given 48 hours in advance with the help of satellite and radar.

→ And self-help is the best help. So it would be helpful to plan your safety in advance and take precautionary measures before any cyclone actually strikes.

→ Wind: Fast-moving air is called wind.

→ Monsoon winds: The winds that come from the sea and carry water are called monsoon winds.

→ Tornado: Dark coloured cone-like clouds whose cone structure is from sky to earth is called Tornado.

→ Cyclone: A violent wind that moves in a circle causing a storm is called a cyclone.

This PSEB 7th Class Science Notes Chapter 7 Weather, Climate and Adaptations of Animals to Climate will help you in revision during exams.

PSEB 7th Class Science Notes Chapter 7 Weather, Climate and Adaptations of Animals to Climate

→ The weather of a place changes day by day and week by week.

→ The weather depends on temperature, humidity, and rainfall.

→ Humidity is a measure of water vapour in the air.

→ Indian Meteorological Department of weather forecasting daily collects statistical data of heat, wind speed at various places and makes weather predictions.

→ Atmospheric conditions in terms of temperature, humidity, rainfall, wind speed, etc. of a place are called the weather of that place.

→ The weather can change in an instant.

→ Factors on which the weather depends, are called elements of weather.

→ Special high-low thermometers are used to measure the temperature.

→ The highest temperature of the day is usually in the afternoon and the lowest is normal usually in the morning.

→ All changes in the weather are caused by the sun.

→ In winters, the length of the day is shorter and the night is earlier.

→ The length of the weather of a place is based on the data collected at that place is called the climate of that place.

→ The climate of different places is different. It changes from hot and dry to hot and humid.

→ Energy reflected and absorbed by the earth’s surface, ocean and atmosphere play important roles in determining weather at any place.

→ Climate has a great impact on living things.

→ Animals are adapted to the conditions in which they live.

→ The Polar Regions are located near the poles, such as the North Pole and the South Pole.

→ Canada, Greenland, Iceland, Norway, Sweden, Finland and Alaska, and Siberian areas of Russia in America, are the Polar Regions

→ Tropical rainforests are found in India, Malaysia, Indonesia, Brazil, the Republic of Congo, Kenya, Uganda, and Nigeria. The Polar Regions have a cold climate.

→ Rainfall is measured by an instrument called the rain gauge.

→ Penguins and polar bears live in Polar Regions.

→ The Polar Regions are covered with white ice.

→ The white hairs on the polar bear’s body help protect it and catch prey.

→ Penguins are well-known animals found in Polar Regions. It is also white and merges well with the background.

→ In addition to polar bears and penguins, many other animals are found in Polar Regions.

→ Many fishes can live in cold water.

→ The climate of the Subtropical Regions is generally warmer, as these areas are closer to the equator.

→ Temperatures in these regions vary from 15°C to 40°C.

→ In areas near the equator, the length of night and day are approximately equal throughout the year.

→ Weather: Everyday changes in the atmosphere in terms of temperature, humidity, rainfall, wind speed, etc., is called the weather of that place.

→ Climate: The average weather pattern taken over a long time, say 25 years is called the climate of the place.

→ Adaptation: The special characteristics of plants and organisms, that is, the nature that enables them to live in a habitat, is called adaptation.

→ Migration: Moving from one place to another to avoid harsh climatic conditions by birds and animals is called migration.

This PSEB 7th Class Science Notes Chapter 6 Physical and Chemical Changes will help you in revision during exams.

PSEB 7th Class Science Notes Chapter 6 Physical and Chemical Changes

→ Change is the tendency of life. There are many changes in our daily life.

→ There are two types of changes:

• Physical changes
• Chemical changes

→ There is always a reason for the change.

→ Some changes can be controlled and some others cannot be controlled.

→ No new matter is formed in physical change.

→ Chemical changes usually cannot be reversed.

→ The properties of new substances produced in a chemical change are completely different (new).

→ Changes can be classified based on their similarities.

→ The properties of a substance such as size, measure, color, state are called its physical properties.

→ The change that takes place in the physical properties of a substance is called a physical change.

→ The magnesium strip (ribbon) is bums with bright white light.

→ When Carbon dioxide is passed through lime water, it becomes milky.

→ Chemical change produces sound, light, heat, smell, gas, color, and so on.

→ Burning is a chemical change in which there is always an outflow of heat.

→ There is a layer of Ozone in the atmosphere.

→ For the occurrence of rust both oxygen and water are required.

→ In the galvanization process, a layer of zinc is deposited on the iron.

→ Iron can be saved from rust by applying paint.

→ Large crystals can be obtained from a saturated solution of a substance by crystallisation method.

→ Physical changes: Changes in which only the physical properties of matter change and no new matter is created are called physical changes. Example: Salt solution in water.

→ Chemical changes: Changes that involve the formation of new substances with new properties are called chemical changes. Example: Burning of coal.

→ Rust: The process in which iron gets covered with a layer of brownish substance in the presence of moist air is called rust.

→ Galvanization: The process of depositing zinc on iron to protect it from corrosion is called Galvanization.

→ Crystallisation: The process of obtaining large size crystals of a soluble substance is called crystallisation.

This PSEB 7th Class Science Notes Chapter 5 Acids, Bases and Salts will help you in revision during exams.

PSEB 7th Class Science Notes Chapter 5 Acids, Bases and Salts

→ We eat many foods with different tastes in our daily life.

→ Some foods taste bitter, sour, sweet, and salty.

→ The sour taste of the substance is due to the acid present in them.

→ The word acid is derived from the Latin word ‘acere’, which means sour.

→ Substances that have a bitter taste and are soapy to touch, are called the base.

→ Indicators are substances that give different colours to substances or solutions of acidic and basic nature.

→ They are used to test the acidic or alkaline nature of substances.

→ Turmeric, litmus, and China rose petals (Gudhal) are natural indicators.

→ Neutral solutions do not change the color of litmus red or blue because they are neither acidic nor basic.

→ Phenolphthalein is a synthetic indicator that is prepared in the laboratory.

→ Some acids are strong and some are weak.

→ The reaction between an acid and a base is called Neutralisation.

→ Antacids are used to treat indigestion.

→ Solution of baking soda (Sodium hydrogen carbonate) rubbed to treat the effects of insect bites.

→ The basicity of the soil is eliminated by the use of organic matter.

→ The acidity of the soil is treated with bases like a quick (calcium oxide) or slaked lime (Calcium hydroxide).

→ Waste products from factories should be released into the water only after treatment with basic substances.

→ Acids: Substances that have a sour taste and which react with blue litmus solution to make its color red are called acids.

→ Bases (Alkali): Substances that have a bitter taste and which react with red litmus solution to make it blue are called bases.

→ Neutralisation: The reaction between an acid and an alkali is called neutralisation.

→ Neutral solution: A solution that is neither acidic in nature nor alkaline in nature is called a neutral solution or solution which does not change the color of the indicator is called a neutral solution.

→ Indicators: Indicators are substances that show different colours by reacting with different acids, salts, and bases.

This PSEB 7th Class Science Notes Chapter 4 Heat will help you in revision during exams.

PSEB 7th Class Science Notes Chapter 4 Heat

→ The method of determining whether an object is hot or cold by touching it is not reliable.

→ Temperature is the degree of hotness or coldness of an object.

→ The hot or cold state of an object, i.e. the temperature is measured with an instrument called a thermometer.

→ The temperature of a human or living organism is measured with a medical thermometer (or clinical thermometer)

→ A scale is present on a medical thermometer. This scale is either in Celsius [°C] or Fahrenheit [°F] or both.

→ Medical thermometers have a narrow, homogeneous tube of glass with a bulb at the bottom.

→ There is a kink near the bulb of a medical thermometer that prevents the mercury level from falling as a result of its weight.

→ Should clean with antiseptic solution before and after use of a medical thermometer.

→ The scale range of medical thermometers is from 35°C to 42°C.

→ Before using a medical thermometer, make sure that the mercury level is below 35° C.

→ If not, hold the thermometer firmly and shake it to bring a level of mercury below 35°C.

→ The normal temperature of a healthy person is 37°C or 98.4°F.

→ There are other thermometers to measure the temperature of objects.

→ One of these is the Lab thermometer. The lab thermometer ranges from -10°C to 110° C.

→ The temperature of the object should be measured with a lab thermometer when the mercury level in the thermometer becomes stable.

→ The method by which heat is transferred from the hotter end of an object to the cold end by the particles of material of the object is called conduction. Solids are heated by the conduction method.

→ Materials that transmit heat are called conductors.

→ Items made of iron, silver, copper, aluminium are heat conductors.

→ Substances that do not conduct heat well are called insulators or non-conductors, e.g. Wood, plastic, and rubber.

→ Air is not a good conductor of heat.

→ The method of heat transfer in which heat is transmitted by the motion of hot molecules of a substance is called convection.

→ Heat is transmitted in liquids and gases by the convection method,

→ In coastal areas, the wind that blows from the sea to the coast during the day is called Sea breeze.

→ In coastal areas, the air that blows from the coast to the sea at night is called land breeze.

→ Radiation is the method of transfer of heat due to the emission of radiations by hot objects without a medium.

→ Dark coloured fabrics absorb heat more than light coloured fabrics.

→ So in winter, we wear dark colours and in summer we wear light coloured clothes.

→ Woolen garments keep us warm in winter because of the air trapped in the wool fibres which is a bad conductor of heat.

→ Heat: It is an agent which produces in us the sensation of warmth. This is a kind of energy.

→ Temperature: Degree of hotness or coldness measured on a definite scale.

→ Thermometer: An instrument used to measure the temperature of an object.

→ Celsius Scale: The Celsius scale is a scale for measuring temperature. Sometimes it is also called as the centigrade scale.

→ Resistor: A substance through which heat cannot be transmitted properly is considered to be resistor or resistant to heat.

→ Conduction: This is the method of heat transfer in which heat passes from the hot end of the object to the cold end through the molecules of the material, but the molecules of the object remain fixed in their place.

→ Convection(Liquid or Gas): This is the method of heat transfer in which heat is transferred from the source of heat to the cold part due to the motion of hot molecules and the cold molecules come down to take their place. This method is used for heating liquids and gases.

→ Radiation: This is the method of heat transfer in which heat is transmitted from a hot source or body directly to a cool body without affecting the medium.

→ Sea breeze: Due to the heat of the sun during the day, the soil of the land gets heated very quickly when water molecules of the ocean are not so hot. Therefore, the air near the ground gets warmer and rises up due to being lighter.

→ To replace it, cool air begins to flow from the ocean, causing air currents to flow. The wind that blows from the ocean to the land is called the sea breeze.

→ Land breeze: Due to high heat absorption capacity, water cools later than land, due to which cold air starts flowing towards seawater which is called land breeze.

→ Fahrenheit Scale: The Fahrenheit scale is a scale designed to measure temperature.