Adsorption is defined as fumigant molecules doing what?

• A. Adhere to the surface of a treated material
• B. Penetrate the material
• C. Evaporate into the air
• D. React with the material

Answer: (A)

Adsorption is about fumigant molecules adhering to the surface of a treated material. This describes the molecules sticking to the outer layer rather than entering into the material. It’s not about penetration into the material (that would be absorption), not about turning into gas and leaving the surface (that’s evaporation), and not about a chemical reaction with the surface. So the option that describes sticking to the surface is the correct one.