Air Composition, Density, Pressure

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

• air pressure
• density
• volume
• none of the above

What does the air consist of?

• molecules
• helium
• density
• weather

In what direction(s) does air exert pressure?

• everywhere
• no where
• there is no pressure
• downward

A _____________ is the scientific  instrument used to measure air pressure.

• barometer
• thermometer
• mercury
• watch

What is altitude?

• how much something weighs
• the distance above sea level
• how big something is
• how far away something is

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

• decreases
• increases
• stays the same

What happens to the amount of oxygen molecules as altitude increases?

• fewer molecules
• more molecules
• same amount of molecules
• nothing happens to the molecules

Air pressure is greatest when near Earth's surface because?

• The air molecules are farther apart.
• The air molecules are closer together.
• Air molecules collide.
• Air molecules are tightly packed.

Cold air exerts _____________ pressure than warm air.

• the same
• more
• less

Density of air is greater at high altitudes.

• true
• false