Specific Heat at Constant Pressure

Let us focus on Figure 7.3

Figure 7.3

• System changes its state from 1 to 2 following a constant pressure process.
  
• There will be an accompanying change in temperature.

Specific heat at constant pressure is defined as the quantity of energy required to change the temperature of a unit mass of the substance by one degree during a constant pressure process.

(7.9)

The total heat interaction for a change in temperature from T₁to T₂ can be calculated from

(7.10)

The molar specific heat at constant pressure can be defined as

(7.11)