# Pressure of an Ideal Gas

Written by Jerry Ratzlaff on . Posted in Thermodynamics

In an ideal gas, molecules have no volume and do not interact.

## Pressure of an Ideal Gas formula

 $$\large{ p = \frac {n \; R \; T_a}{V} }$$

### Where:

 Units English Metric $$\large{ p }$$ = pressure $$\large{\frac{lbf}{in^2}}$$ $$\large{Pa}$$ $$\large{ T_a }$$ = absolute temperature $$\large{R}$$ $$\large{K}$$ $$\large{ n }$$ = amount of substance $$\large{dimensionless}$$ $$\large{ R }$$ = specific gas constant (gas constant) $$\large{\frac{ft-lbf}{lbm-R}}$$ $$\large{\frac{J}{kg-K}}$$ $$\large{ V }$$ = volume $$\large{ in^3 }$$ $$\large{ mm^3 }$$