Air and Air Pressure

Front

78% of the gas that makes up the atmosphere is ________?

Back

Nitrogen

Front

What is altitude?

Back

The distance above sea level.

Front

Cold air exerts _____________ pressure than warm air.

Back

More pressure.

Front

What does the air consist of?

Back

Molecules.

Front

What is the primary component of the Earth's atmosphere?

Back

Nitrogen.

Front

What is air pressure?

Back

The force exerted by the weight of air above a surface.

Front

How does temperature affect air pressure?

Back

Warm air rises and exerts less pressure; cold air sinks and exerts more pressure.

Front

What happens to air pressure as altitude increases?

Back

Air pressure decreases.

Front

What is the composition of dry air?

Back

Approximately 78% nitrogen, 21% oxygen, and 1% other gases.

Front

What is the role of oxygen in the atmosphere?

Back

Essential for respiration in living organisms.