# Steam Density

Written by Jerry Ratzlaff on . Posted in Thermodynamics

Steam density, abbreviated as $$\rho$$  (Greek symbol rho), has a higher density than water vapor, the higher the pressure the higher the steam density.

## Steam Density FORMULA

 $$\large{ \rho_s = \frac{P \; MW}{R^* \; T} }$$

### Where:

 Units English Metric $$\large{ \rho_s }$$  (Greek symbol rho) = steam density $$\large{\frac{lbm}{ft^3}}$$ $$\large{\frac{kg}{m^3}}$$ $$\large{ MW }$$ = molecular weight of water $$\large{\frac{lbm}{lbmol}}$$ $$\large{\frac{kg}{kmol}}$$ $$\large{ P }$$ = pressure $$\large{\frac{lbf}{in^2}}$$ $$\large{Pa}$$ $$\large{ T }$$ = temperature $$\large{F}$$ $$\large{K}$$ $$\large{ R^* }$$ = universal gas constant $$\large{ \frac{lbf-ft}{lbmol-R} }$$ $$\large{ \frac{J}{kmol-K} }$$