Materials can be separated into four general classes on the basis of their permeance. One class, vapor semi-permeable, means ____.
A) 0.1 perm or less
B) greater than 0.1 perm and less than 1.0 perm
C) greater than 1.0 perm and less than 10.0 perms
D) greater than 10.0 perm

Question

Quizplus · Accepted Answer

Vapor semi-permeable materials have a permeance greater than 1.0 perm and less than 10.0 perms, allowing some vapor to pass through but not as freely as highly permeable materials.

Materials Can Be Separated into Four General Classes on the Basis