The Invisible Power of Air

Why don't we notice the movement of air most of the time?

• Because air is invisible

• Because air is lighter than water

• Because air is uniform

• Because air is empty space

What is air pressure?

• The force exerted by air molecules

• The weight of air

• The movement of air

• The density of air

Why are we not immediately crushed by the weight of air in a room?

• Because most of the air is pressing on the floor and walls

• Because the air inside our bodies pushes back

• Because air is lighter than water

• Because the air molecules are too small

What happens when air pressure is not uniform?

• The air becomes lighter

• The air becomes denser

• The air flows from higher pressure to lower pressure

• The air becomes stagnant

What do meteorologists study in relation to air pressure?

• The movement of air

• The temperature of air

• The humidity of air

• The pressure systems

How do we breathe?

• By increasing the pressure in our lungs

• By lowering the pressure in our lungs

• By inhaling air through our nose

• By exhaling air through our mouth

What is the significance of differences in air pressure?

• They allow us to complain about the weather

• They cause wind and other weather changes

• They make it difficult to survive at high altitudes

• They make the air denser