Understanding Atmospheric Pressure

Air under greater pressure weighs less than air under lower pressure.

Air under greater pressure weighs half as much as air under lower pressure.

Air under greater pressure weighs twice as much as air under lower pressure. (correct)

Air under greater pressure weighs the same as air under lower pressure.

Density of gases varies inversely with pressure.

Density of gases varies directly with temperature.

Density of gases varies directly with pressure. (correct)

Density of gases varies inversely with temperature.

On damp days, the air density is greater than on dry days. (correct)

Absolute humidity is the ratio of moisture actually in the air to the moisture it would hold if it were saturated at the same temperature and pressure.

Relative humidity is the weight of water vapor in a unit volume of air.

Density of air varies directly with humidity.

<p>Water vapor in air makes it lighter than dry air.</p> Signup and view all the answers

<p>An object in motion with respect to one object can be at rest with respect to another.</p> Signup and view all the answers