Properties of common gases at room temperature and pressure

The above values are for T=25°C.

Densities and specific weights in the above table are calculated directly from the specific gravity of air at $25^\circ\text{C}$:
$ \rho=1.18765~\text{kg}/\text{m}^3=0.0023~\text{slugs}/\text{ft}^3\,, \gamma=11.65~\text{N}/\text{m}^3=0.0741~\text{lb}/\text{ft}^3 \,. $

References:
Bolz, R. E., and Tuve, G. L. (1973). *CRC handbook of tables for applied engineering science.* Cleveland, Ohio, CRC Press [1973].
	Specific Gravity (sg)	Specific Weight $(\gamma)$		Density $(\rho)$		Dynamic Viscosity $(\eta)$		Kinematic Viscosity $(\nu)$		Specific Heat ($C_p$)		Gas Constant ($R$)		$k=C_p/C_v$
		$\textrm{N}/\textrm{m}^3$	$\textrm{lb}/\textrm{ft}^3$	$\textrm{kg}/\textrm{m}^3$	$\textrm{slugs}/\textrm{ft}^3$	$\textrm{Pa}\cdot s$	$\textrm{lb}\cdot s/\textrm{ft}^2$	$\textrm{m}^2/s$	$\textrm{ft}^2/s$	kJ/(kg K)	Btu/(lbm R)	kJ/(kg K)	Btu/(lbm R)