As air in the figure above moves from A to B, what will happen to its density?

Question

Quizplus · Accepted Answer

According to the continuity equation, as air moves from a wider region to a narrower region, its velocity must increase to maintain the same mass flow rate. Since density and velocity are inversely proportional (i.e., as velocity increases, density decreases), the air density must decrease as it moves from A to B. Therefore, B is the correct answer.

As Air in the Figure Above Moves from a to B