public
Calculate gas density using molecular weighr and compresibility factor.
Molecular weight
$$ MW = 28.97 \:
g/mol $$
Gas compressibility factor
$$ z_{gas} = 1 \:
$$
$$ \rho_{gas} = {{( P_{abs} \cdot MW ) \over \left({ z_{gas} \cdot R_{gas} \cdot T_{gas_K} }\right)}} \:, kg/m^3 $$