Question

question 3
5 points
which of the following is true about air molecules in the atmosphere?
a air molecules are spaced out further apart nearest the surface, and close together high in the atmosphere
b the density of air molecules decreases as pressure decreases

Explanation:

Air density is related to pressure. According to the ideal - gas law and principles of physics, as pressure decreases (such as at higher altitudes), the density of air molecules decreases. Air molecules are closer together near the surface due to the weight of the air above creating higher pressure, and more spaced out at higher altitudes. Option A has the relationship reversed.

Answer:

B. The density of air molecules decreases as pressure decreases