The gush of steam that issues from the escape valve of a pressure cooker is relatively cool
A)above the opening where expansion is prominent.
B)close to the opening.
C)none of the above

Question

Quizplus · Accepted Answer

The gush of steam is relatively cool above the opening where expansion is prominent because it is rapidly expanding and cooling as it moves away from the high-pressure environment inside the pressure cooker. Therefore, choice A is the best answer. The steam close to the opening may still be relatively hot due to the residual pressure and heat inside the pressure cooker, making choice B incorrect. Choice C is incorrect as either A or B must be correct.

The Gush of Steam That Issues from the Escape Valve