Question

which statement accurately describes the relationship between air pressure, air density, or altitude? as altitude increases, pressure increases. as altitude increases, air density increases. air pressure and density are lowest at sea level. denser air exerts more pressure than less dense air.

Explanation:

• Option 1: As altitude increases, the number of air molecules above a given point decreases. So, air pressure decreases with increasing altitude, not increases.
• Option 2: Higher altitude means less air is pressing down, and the air molecules are more spread out. So, air density decreases with increasing altitude, not increases.
• Option 3: At sea - level, there is a large column of air above. So, air pressure and density are highest at sea - level, not lowest.
• Option 4: Pressure is related to the number of molecules and their motion. Denser air has more molecules in a given volume. According to the ideal gas law \(PV = nRT\) (where \(P\) is pressure, \(V\) is volume, \(n\) is the number of moles, \(R\) is the gas constant, and \(T\) is temperature), if we consider a fixed volume and temperature, more molecules (\(n\)) (denser air) will exert more pressure.

Answer:

D. Denser air exerts more pressure than less dense air.