Wind systems

Air pressure is the force exerted on an unit area of the earth's surface by the weight of a column of air above it.

• TRUE

• FALSE

Answer explanation

Air pressure is the force exerted by air, whether compressed or unconfined, on any surface in contact with it. In Geography, we are concerned about atmospheric air pressure, hence, we will be more concerned about the force exerted on the earth's surface.

Air pressure is measured in millibars. What is the units of measurement expressed?

• mb

• mlb

• mlbs

• mlbs

When air is heated, it expands and rises, creating an area of ( ) pressure

Wind moves from an area of

• low pressure to high pressure

• low wind speed to high wind speed

• high wind speed to low wind speed

• high pressure to low pressure

Sea breeze occurs in the

• night

• throughout the day

• day

• summer months only

The greater the difference in air pressure, the stronger the wind speed

• true

• false

which instrument is not ideal in the measurement of wind direction

• wind sock

• wind vane

• compass