Weather Maps

What is atmospheric (air) pressure?

• Pressure caused by the weight of air above an area

• Atmospheric pressure is the force exerted by gravity
• Atmospheric pressure is the force exerted by the ocean
• Atmospheric pressure is the force exerted by the sun

Pressure __________ with increasing height above Earth

• increases

• decreases

What tool is used to measure air pressure?

• thermometer

• anemometer

• barometer

• rain guage

What units are used to measure air pressure?

• degrees

• inches

• millibars

• mph (miles per hour)

High pressure creates ______ pressure on the barometer.

• less

• greater

• no

Low pressure creates ______ pressure on the barometer.

• less

• greater

• no

As air cools, it becomes more dense and sinks toward the Earth's surface spinning clockwise.

• High pressure

• Low pressure

As air warms, it becomes less dense and rises above the Earth's surface spinning counter-clockwise.

• High pressure

• Low pressure

The following conditions indicate High Pressure or Low Pressure?

Sunny, clear skies; calm winds; cool, dry air

• Low Pressure

• High Pressure

The following conditions indicate High Pressure or Low Pressure?

Cloudy, stormy skies; strong winds; warm, moist air

• Low Pressure

• High Pressure