Effusion

Definition

Effusion is the process by which gas particles pass through a tiny opening from a region of high pressure to one of lower pressure.

Related terms

Graham's Law:

This law states that the rate of effusion (or diffusion) for a gas is inversely proportional to the square root of its molar mass.

Pressure Gradient: This refers to the change in pressure across distance, which often drives effusion.

Permeability: This term describes how easily a substance can pass through a material or membrane.