Unit-4                                       HEAT                                               

Ø  Heat is a form of energy that gives sensation of warmth.

Ø  Heat is the total kinetic energy of molecules of a system.

Ø  It’s SI unit is joule & CGS unit is calorie.  1 calorie =4.2 joule

Ø  It’s formula :- Q = msdt

Ø   One calorie heat energy is defined as the amount of heat energy required to raise the temperature of one gram of pure water through one degree Celsius ( 1⁰C )

# Effects of heat :-

    i. It can changes the temperature of body                     ii. It can changes the size of body.

    iii.It can changes solubility of body.                                Iv. It can changes state of matter.