gas adsorption isotherm

A gas adsorption isotherm describes how gas molecules stick to a material's surface at a constant temperature as the pressure changes. It shows the relationship between the amount of gas that the material can hold and the pressure applied. This is useful for understanding properties like porosity and surface area. The curve reveals how quickly the material becomes saturated with gas, helping scientists design better catalysts, filters, or storage systems by revealing how gases interact with surfaces under different conditions.