Question

What is the specific heat of air?

Answer 1

We need to know that the direction of flow is from the object at higher temperature to the object at lower temperature. This flow will reduce the higher temperature and increase the lower temperature until the two objects have a common temperature.

Complete answer:
Specific heat ($C$) is the amount of heat required to change the temperature of a mass unit of a substance by one degree.
Isobaric specific heat (${C_p}$) is used for air in a constant pressure ($\Delta P = 0$) system.
Isochoric specific heat (${C_v}$) is used for air in a constant volume, ( isovolumetric or isometric) closed system.
At normal atmospheric pressure of $1.013bar$ - the specific heat of dry air - ${C_p}$ and ${C_v}$ - will vary with temperature. This may influence the accuracy of air conditioning and industrial air handling process calculations. When calculating mass and volume flow of air in heated or cooled systems with high accuracy - the specific heat which is heat capacity and it should be corrected according values in the figures and table below, or found by use of the calculator.
For ordinary calculations - a value of specific heat ${C_p} = 1.0KJ/KgK$ (equal to $KJ/Kg^\circ C$) is normally accurate enough.
For higher accuracy - a value of ${C_p} = 1.006KJ/KgK$ (equal to $KJ/Kg^\circ C$) is better.

Note:
We have to know that the specific heat depends upon the nature of the substance which is Large for insulators and small for a metal. It also concerns the storage of thermal energy. The specific heat ($C$) varies strongly from substance to substance. The specific value is low for amalgam and it requires little thermal energy to change its temperature.