Understanding Hot Air Balloons

What is inside a hot air balloon that makes it float?

• Hydrogen

• Special gas

• Helium

• Just air

What are molecules?

• Drops of water

• Bubbles of air

• Large particles

• Tiny invisible particles

What happens to air molecules when they heat up?

• They move slower

• They move faster

• They disappear

• They change color

Why does the hot air balloon rise?

• The hot air inside is less dense than outside

• Magic

• Because it's big

• It has wings

What does the pilot do to make the balloon go up?

• Turns on the flames to heat the air

• Flaps the wings

• Pumps water

• Adds more air

What is matter?

• Anything that takes up space

• Only solids

• Imaginary stuff

• Only liquids and gases

How does the balloon come back down?

• The pilot opens a flap to let hot air out

• The pilot climbs down

• It never comes down

• The air cools down

What is the role of the heater in a hot air balloon?

• To light up the balloon

• To heat the air inside the balloon

• To keep the passengers warm

• To cook food

What is true about warm air?

• It sinks

• It stays the same

• It rises

• It turns into liquid

What can you say about air?

• It doesn't exist

• It is made of matter

• It is nothing

• It is only inside balloons