Foam lowers surface tension of water, allowing it to_______ fires in Class A materials.
A) cool
B) smother
C) suppress
D) penetrate

Question

Quizplus · Accepted Answer

Foam lowers the surface tension of water, enhancing its ability to penetrate into the materials of Class A fires, which typically involve common combustibles like wood, paper, and cloth. This penetration is crucial for effectively reaching the deeper, smoldering parts of the fire to extinguish it.

Foam Lowers Surface Tension of Water, Allowing It To_______ Fires