Air Pressure

What is atmospheric pressure?

• atoms

• molecules

• weight of all atoms and molecules in the air pushing down

• size of all atoms and molecules in the air

What instrument is used to measure air pressure?

• barometer

• thermometer

• wind vane

• anemometer

In what direction do molecules push in the air?

• everywhere

• no where

• there are no molecules

• downward

What happens to the oxygen molecules as altitude increases?

• there are fewer molecules

• there are more molecules

• same amount of molecules

• nothing happens to the molecules

As you climb up a mountain what happens to the air pressure?

• it decreases

• it increases

• stays the same

The air pressure at the bottom of a mountain should be _______ than at the top.

• greater than

• less than

What happens to air pressure as you move upward into the atmosphere?

• increases
• decreases
• stays the same

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

• True
• False

What type of heat transfer allows the surface of Earth to heat air masses above it?

• conduction

• convention

• convection

• radiation

Why does convection take place in our atmosphere?

• cold air is more dense than warm air

• warm and cold air have the same density

• cold air is less dense than warm air