### 14.2.3. CEL Constants

Right-click in the Expression details view to access the following useful constants when developing expressions:

Table 14.2: CEL Constants

Constant | Units | Description
--- | --- | ---
R | J K^-1 mol^-1 | Universal Gas Constant: 8.314472
avogadro | mol^-1 | 6.02214199E+23
boltzmann | J K^-1 | 1.3806503E-23
clight | m s^-1 | 2.99792458E+08
e | Dimensionless | Constant: 2.7182818284590452
echarge | A s | Constant: 1.60217653E-19
epspermo |  | 1./(clight*clight*mupermo)
g | m s^-2 | Acceleration due to gravity: 9.8066502
mupermo | N A^-2 | 4*pi*1.E-07
pi | Dimensionless | Constant: 3.1415926535897931
planck | J s | 6.62606876E-34
stefan | W m^-2 K^-4 | 5.670400E-08

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