What is the process of gas adhering to surfaces known as?

The process of gas adhering to surfaces is referred to as adsorption. This phenomenon occurs when molecules from a gas phase collect on the surface of a solid or liquid, resulting in a film of the gas on that surface. Adsorption is different from absorption, where a substance permeates or is taken up throughout the bulk of a solid or liquid.

In applications related to filtration and air quality, understanding adsorption is essential, as it is often utilized in air filters and purification systems that capture gases and volatile organic compounds (VOCs) from the air. The interaction between the gas molecules and the surface can be influenced by various factors such as temperature, pressure, and the nature of the adsorbent material.