A) Definition : heat is a form of energy. it measured in calories and B.T.U(Fahrenheit = 1 b.t.u )
Calory : the amount of heat require to raise 1 degree temp of 1 gram water is called 1 calory.
B.T.U : Energy require to raise 1 degree temp of 1 pound water . (1 B.T.U = 1 Fahrenheit )
C) Specific heat : energy required to raise 1 degree of any 1 gm substance.
D) Latent heat : 1. Latent heat of vaporization.
2. Latent heat of freezing
Latent heat of vaporization : amount of heat required to convert 1 gm of water in to vapor is called latent heat of vaporization of water.(at 100 degree , 540 calories/gm needed for water)
Latent heat of freezing: amount of heat required to convert 1 gm of water in to solid ice is called latent heat of vaporization of water.(at 0 degree , 80 calories/gm needed to convert water to ice)
TRANSMISSION OF HEAT
The heat travels through the molecule of substance without movement of molecule themselves.(molecule doesn’t travels.)
2) Convection :