Constants and Units

Units

The following units are used in ERF:

Name	Units	Description
\(t\)	\(s\)	time
\(\rho\)	\(kg/m^3\)	density
\(\mathbf{u}\)	\(m/s\)	velocity
\(p\)	\(Pa\)	pressure
\(T\)	\(K\)	temperature
\(\theta\)	\(K\)	potential temperature

Constants

Name	Value	Description
\(R_d\)	287.0 J/kg/K	gas constant for dry air
\(c_p\)	1004.5 J/kg/K	specific heat capacity
\(p_0\)	1.0e5 Pa	reference pressure
\(g\)	9.81 m/s/s	gravity
\(\gamma\)	1.4	\(c_p /(c_p-R_d)\)

These constants are defined in the file Source/ERF_Constants.H