Question

which statement describes effusion? it occurs when a gas passes through a tiny hole. it occurs when a liquid passes through a tiny hole. it occurs when gas molecules disperse throughout a container. it occurs when a liquid disperses throughout a container.

Explanation:

Effusion is the process where a gas passes through a tiny hole. This is based on the kinetic - molecular theory of gases. Liquid - related processes are not effusion, and gas molecules dispersing throughout a container is diffusion, not effusion.

Answer:

It occurs when a gas passes through a tiny hole.