Question

which phrase describes air density?
o increases as altitude increases
equals mass divided by volume
o pushes molecules in one direction
exerts less pressure as it increases

Explanation:

• Density is defined as mass per unit volume. So, density = mass/volume.
• Air density decreases as altitude increases (not increases).
• Pushing molecules in one direction is related to force or pressure concepts, not density.
• As air density increases, pressure (in a non - altitude - changing, confined situation) would generally increase (not decrease) as more molecules are present in a given volume.

Answer:

equals mass divided by volume