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| Introduction |
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| Heat as a form of Energy |
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| Take two beakers one with hot water and another with cold water. Dip your fingers in hot water your finger experience hotness. Then dip your fingers in cold water. Your fingers experience coldness. What makes the water hot or cold? |
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| Heat energy content in a body makes it hotter or colder. Greater the heat energy content, hotter will be the body. |
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| Heat is a form of energy. This form of energy is very essential for the survival of life in any form. It plays a prominent role in our daily life. For example,we need heat energy for cooking, heating water, ironing, etc. |
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| Heat energy plays a very important role in nature. Weather conditions are totally decided by the heat energy changes. For example, occurrence of seasons, rain, wind, etc. are the result of heat energy changes in nature. |
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| If heat is a form of energy, can we convert it into other forms of energy? Yes. Heat energy can be converted into mechanical energy, light energy, electrical energy. For example, all heat engines convert heat energy into mechanical energy. A very hot body emits light (a filament lamp). Similarly other forms of energy can be converted to heat energy. For example, in an electric iron box, electrical energy is converted to heat energy. |
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