Ch 7 L 2 Air Pressure

To calculate the density of a substance, divide its mass by its what?

• volume

• weight

• height

• area

As altitude increases, what happens to the air pressure?

• air pressure decreases

• air pressure increases

• air pressure is not affected by change in altitude

Most weather reports for the general public use what unit of measurement for air pressure?

• millibars

• inches of mercury

• grams

• millimeters

As altitude increases, the density of the air does what?

• the density of air decreases

• the density of air increases

• the density of air is not affected by altitude

Air pressure is the result of the WEIGHT of a column of air pushing on an area.

• true

• false

The level of mercury in a barometer FALLS as the air pressure falls.

• true

• false

How does air pressure at sea level compare to air pressure at the top of a mountain?

• air pressure at sea level is higher than air pressure on the top of a mountain

• air pressure at sea level is lower than air pressure on the top of a mountain

• air pressure at sea level is the same as air pressure on the top of a mountain

What instrument is used to measure air pressure?

• barometer

• wind vane

• anemometer

• thermometer

Why doesn't air pressure crush things?

• air molecules are pushing in all directions on an object so they don't crush it

• air molecules are not strong enough to crush things

• there are no molecules in air

The amount of mass in a given volume of air is its what?

• density

• area

• height

• weight