# Heat Capacity at Constant Pressure

Written by Jerry Ratzlaff on . Posted in Thermodynamics

At constant pressure, abbreviated as Cp, some of the heat goes to doing work.  The value of heat capacity depends on whether the heat is added at constant volume, constant pressure, etc.

Some Cp values for gasses can be found here (SI Units) or here (US Units)

## Heat Capacity at Constant Pressure Formula

 $$\large{ Q = n \; C_p \; \Delta T }$$

### Where:

 Units English Metric $$\large{ C_p }$$ = heat capacity at constant pressure $$\large{\frac{Btu}{F}}$$ $$\large{\frac{kJ}{K}}$$ $$\large{ n }$$ = amount of substance $$lbm$$ $$kg$$ $$\large{ Q }$$ = heat transfer $$\large{\frac{Btu}{hr}}$$ $$W$$ $$\large{ \Delta T }$$ = temperature differential $$\large{F}$$ $$\large{K}$$