Steam that issues from a pressure cooker
A)is invisible.
B)cools as it expands.
C)both of these
D)neither of these

Question

Quizplus · Accepted Answer

Steam that issues from a pressure cooker is initially invisible because it is in the form of water vapor, which is clear. As it expands and cools, it condenses into tiny water droplets, forming visible steam or mist. This process involves both cooling as it expands and being initially invisible.

Steam That Issues from a Pressure Cooker