The gush of steam that issues from the escape valve of a pressure cooker is relatively cool
A)close to the opening.
B)above the opening where vapor is visible.
C)both of these
D)none of the above

Question

Quizplus · Accepted Answer

The steam is cooler above the opening where the vapor is visible because it has mixed with the cooler air outside, causing some of the steam to condense into tiny water droplets that make the vapor visible. This mixing process also cools the steam.

The Gush of Steam That Issues from the Escape Valve