Partial pressure, diffusion, and gas behavior calculators. Browse our free gas laws tools below — all calculators are instant, accurate, and require no sign-up.
Graham's Law of Diffusion Calculator — Calculate relative diffusion and effusion rates of gases using Graham's law with molecular weight comparisons, isotope separation, and gas identification.
Diffusion Coefficient Calculator — Calculate diffusion coefficients for gases and liquids using Stokes-Einstein, Chapman-Enskog, and Wilke-Chang equations with temperature dependence.
Partial Pressure Calculator — Calculate partial pressures of gases in mixtures using Dalton's law, mole fractions, vapor pressure corrections, and real gas adjustments.