Air Pressure

Front

What is air pressure?

Back

Air pressure is the force exerted by the weight of air molecules on a surface. It is measured in units such as pascals (Pa) or millibars (mb).

Front

In what direction does air exert pressure?

Back

Air exerts pressure in all directions.

Front

How does altitude affect air pressure?

Back

Air pressure decreases with increasing altitude due to the lower density of air at higher elevations.

Front

What is the relationship between air density and altitude?

Back

Air density decreases as altitude increases.

Front

What percentage of Earth's atmosphere is nitrogen?

Back

78% of Earth's atmosphere is composed of nitrogen.

Front

What weather conditions are associated with high pressure systems?

Back

High pressure systems are typically associated with clear, sunny weather.

Front

What happens to air pressure on a cold day?

Back

Air pressure tends to be higher on cold days compared to warm days.

Front

What is the standard atmospheric pressure at sea level?

Back

The standard atmospheric pressure at sea level is 1013.25 hPa (hectopascals) or 1 atm (atmosphere).

Front

What is the effect of humidity on air pressure?

Back

Higher humidity decreases air pressure because water vapor is less dense than dry air.

Front

What is a barometer used for?

Back

A barometer is an instrument used to measure atmospheric pressure.