The tutor offers definitions of diffuse and effuse, two related terms from chemistry.

To diffuse is to spread out, while to effuse is to escape. A gas will diffuse through the atmosphere, while it will effuse through a hole in a container.

Source:

White, J. Edmund. Physical Chemistry, College Outline Series. New York: Harcourt Brace Jovanovich, 1987.

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.