Amount of heat required to change the temperature of one unit of mass under a constant pressure by one unit of temperature:

$\begin{array}{l}\displaystyle c_p = \left( \frac{\delta Q}{\delta m \cdot \delta T} \right)_p\end{array}$

Symbol	Dimension	SI units	Oil metric units	Oil field units
$\begin{array}{l}c_p\end{array}$	L²T⁻²Θ⁻¹	J/(kg⋅°K)	J/(kg⋅°C)	BTU/(lbm⋅°F)

It is a material property and properly tabulated for the vast majority of materials.

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See also