Ch. 5 L. 1 Earth's Atmosphere

Front

What is the atmosphere?

Back

The atmosphere is a layer of gases surrounding the Earth, essential for life, providing oxygen, and protecting from harmful solar radiation.

Front

What is air pressure?

Back

Air pressure is the force exerted by the weight of air above a surface. It decreases with altitude.

Front

Where would you feel more air pressure?

Back

You would feel more air pressure at lower altitudes, such as at sea level, compared to higher altitudes.

Front

Which type of air has MORE air pressure?

Back

Dry air has more air pressure than air with water vapor.

Front

What force attracts gases in the air towards the Earth?

Back

Gravity is the force that attracts gases in the air towards the Earth.

Front

What is a barometer?

Back

A barometer is an instrument used to measure air pressure.

Front

What type of barometer uses mercury?

Back

A mercury barometer uses mercury to measure air pressure.

Front

What type of barometer is an aneroid barometer?

Back

An aneroid barometer measures air pressure without using liquid; it uses a sealed metal chamber.

Front

How does humidity affect air pressure?

Back

High humidity means more water vapor in the air, which weighs less than other gases, resulting in less air pressure.

Front

What happens to air pressure as altitude increases?

Back

As altitude increases, air pressure decreases.