Air Pressure Study Guide

if the air pressure is 30 inches, there is ____________.

1,016 millibars

The line should be ____________________.

below the top mercury line

what is an isobar?

a line on a weather map that joins places that have the same air pressure.

what is isotherm?

a line on the weather map that joins places on a map that have the same temperature.

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air has mass because it is composed of atoms and molecules because air has mass, it has density and pressure the more molecules in a given volume of air, the greater its density.

is air pressure greater at sea level, or on a top of a mountain?

air pressure is greater at sea level because at sea level there is more atmosphere pressing down

why doesn't air pressure crush objects such as your desk?

air pressure pushes in all directions.

another word for elevation or distance above sea level is ________________.

altitude

what is a mercury barometer?

an instrument that measures air pressure using liquid mercury

a __________________ has no liquid.

aneroid barometer

what is a barometer?

any instrument that measures air pressure

The weight of the __________is constantly pressing on your body.

atmosphere

an instrument that is used to measure air pressure is a _____________.

barometer

if mass ___________ and volume stays the same the density decreased.

decreases

true or false? air pressure does not increase as altitude increases, air pressure decreases as altitude increases.

false

true or false? as altitude increases, so does air density.

false

two different units used to measure air pressure are _________________________.

inches of mercury and inches of millibars

what are two units of air pressure are commonly used in weather reports?

inches of mercury and millibars.

If mass increases, and volume stays the same, the density,

increases

if mass stays the same and volume decreases, then density _______________.

increases

if mass stays the same, and volume ________________ the density decreases.

increases

what is an aneroid barometer?

instrument that measures air pressure without using a liquid

what are three properties of air?

mass, density, and pressure

A _____________ contains liquid mercury.

mercury barometer

what is density?

the amount of mass in a given volume of air.

what is altitude?

the distance above sea level.

what is pressure?

the force pushing on

what is air pressure?

the result of the weight of a column of air pushing down on an area.

true or false? as air pressure decreases, so does air density.

true

at higher elevations, air is less dense and has less oxygen. yes or no?

yes. the amount of oxygen in each breath is less at high altitudes.