Specific heat:
- specific heat is a quantity of energy required for a unit mass to change the temperature by 1 K or 1°C.
- Specific heat is a function of operating temperature so it increases with an increase in operating temperature but incremental in value is negligible therefore we need to treat it is independent of temperature.
- In the case of compressible medium-specific heat is defined on basis of constant pressure, constant volume. But in the case of the incompressible medium, both the specific heats are equal.
- Specific heat is a property of medium which indicates the store or absorb of thermal energy. The more the specific heat more the ability to store energy more.
Examples:
- Cwater = 4.187 kJ/kg-K.
- Ciron = 0.45 kJ/kg-K
- (Cp)air = 1.005 kJ/kg-K = 0.24 kcal.Kg-1.C-1
- (CV)air = 0.718 kJ/kg-K.