Gas Laws

• The common units for pressure are mm Hg (torr), atmosphere (atm), and pascal (Pa). The SI unit is the pascal.

• Boyle’s law states that the volume of a given amount of gas at constant temperature varies inversely to its pressure.

PV = k; P₁V₁ = P₂V₂

• Charles’s law states that the volume of a given amount of an ideal gas at constant pressure varies directly with its temperature (in kelvins).

V = bT; V₁/T₁ = V₂/T₂

• Avogadro’s law states for an ideal gas at constant temperature and pressure, the volume varies directly with the number of moles of gas (n).

V= an; V₁/n₁ = V₂/n₂

• The ideal gas law describes the relationship among P, V, n, and T for an ideal gas.

PV = nRT, where R = 0.08206 (L x atm)/(K x mol)