The rate of diffusion of a gas into or out of a liquid is directly proportional to the partial pressure of that gas. This best describes:

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Henry's law states that the amount of gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid. This is related to the rate of diffusion as the higher the partial pressure of the gas, the more gas molecules will diffuse into the liquid, and vice versa. Fick's law describes the rate of diffusion of a molecule through a material, not specifically related to the pressure of the gas. Dalton's law describes the total pressure of a gas mixture as the sum of the partial pressures of each gas, and Graham's law relates the rate of effusion (not diffusion) of a gas to its molar mass.

The Rate of Diffusion of a Gas into or Out