HEAT

HEAT
1. Define heat or heat energy with its unit.
-Heat or heat energy is defined as the sum of the kinetic energy possessed by the molecules of an object. It's S.I unit is Joule and C.G.S. unit is calorie.

2. Write the factors on which the heat depends.
- The factors on which the heat depends are:
a. The number of atoms of matter.
b. The average Kinetic energy of the molecules.

3. Define one calorie and one joule heat .
- The quantity of heat required to raise the temperature of one gram of pure water by  one kelvin or one degree Celsius is called one calorie.
- The quantity of heat required to raise the temperature of one kilogram of pure water by one kelvin or one degree Celsius is called one joule heat.

4. Write the effects of heat. 
- The effects of heat are:
a. Heat causes change in volume.
b. Heat causes change in state.
c. Heat causes change in solubility.
d. Heat causes change in temperature.

5.  Define temperature with its unit.
- Temperature is defined as the average kinetic energy of the molecules of an object.

or

- Temperature is defined as the measure of degree of hotness or coldness of the body.

It's S.I. unit is kelvin, Fahrenheit and centigrade.

6. What are the effects of heat?
- The effects of heat are as follows:
- Heat causes change in volume.
- Heat causes change in temperature.
- Heat causes change in the solubility.
- Heat causes change in physical state.

7. Define temperature with its SI unit. 
- It is defined as the average kinetic energy of the molecules. Its SI unit is kelvin.

8. State the principle of thermometer.
- It states that substance expand in heating and contracts on cooling.