$PV=nRT$ The units are in standard SI.

• Pressure in Pascals
• Volume in metres cubed
• n is moles
• R is $\frac{J}{molK}$
• T is kelvin.

Deviations in the model

In real gasses: High pressures: Molecules are forced closer together, and empty space between particles are diminished. The assumption that volume of the particles becomes less valid. Low temperatures: At low temperatures, the intermolecular forces between particles becomes more prominent.

Volume: 22.7 $mold{m}^{-3}$