How Do Hot Air Balloons Work?

What is air made of?

• Water

• Nothing

• Tiny molecules

• Clouds

What happens to tiny molecules when they get warm?

• They stop moving

• They move faster and spread out

• They get smaller

• They turn into water

Why does a hot air balloon go up into the sky?

• It has a big engine

• The air inside becomes less dense

• It is pushed by strong winds

• It is filled with cold air

How does a hot air balloon come back down to the ground?

• The air inside the balloon becomes cooler and denser

• The pilot adds more weight to the basket

• The pilot turns on a special fan to push it down

• The balloon runs out of fuel