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6, జులై 2016, బుధవారం

General Science: Heat Energy

Heat: - We use ‘hot’, ‘cold’ terms daily. - Hot and cold are relative terms. - Heat is a form of energy. Activity to understand Hea... thumbnail 1 summary
Heat:
- We use ‘hot’, ‘cold’ terms daily.
- Hot and cold are relative terms.
- Heat is a form of energy.
Activity to understand Heat:
1. Keep a piece of wood and a piece of metal in a fridge or ice box for 15 minutes.
2. After 15 minutes take them out, we feel that they were cold to touch.
3. When we touch metal piece or wooden piece, the heat energy is being transferred from our body to metal piece or wooden piece.

4. Therefore, we feel they are cold.
Heat – Definition:
Heat is an energy that flows from a hotter body to colder body.
- The    SI unit of heat: Joule (J)
            C.G.S unit of heat: Calorie (cal)
- 1 Calorie = 4.186 joules.
Calorie:
The amount of heat required to raise the temperature of 1 gram of water by 10 C is called Calorie.
- 1 Calorie = 4.186 joules.

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