Definition of few Important quantities Thermal Equilibrium, Specific Heat, Water equivalent

Thermal Equilibrium
When two body is in contact and there is no transfer of heat between two body then bodies said to be in thermal equilibrium

Specific Heat
The amount of heat required to increase the temperature of unit mass of the substance by 1 degree centigrade is called specific Heat

Thermal capacity
it is defined as the amount of heat energy required to increase its temperature through 1 degree centigrade.

Its S.I unit is Joule/kelvin

Latent Heat

The heat energy released or absorbed at constant temperature per unit mass for change of state is called latent Heat.

Q = mL

L= latent heat
m= mass of substance

Water equivalent
It is the quantity of water whose thermal capacity is same as the heat capacity of body . it is denoted by W

W= ms

Hoar Frost

The conversion of solid into vapour state is called hoar frost

Sublimation
The direct conversion of solid into vapour state is called Sublimation.

Boiling point

It is the temperature at which liquid get boils is called boiling point

Melting Point

Conversion of solid into liquid at constant temperature is called Melting .