What Happens When You Lose a Balloon?

Why do balloons filled with helium float up into the sky?

• They are filled with regular air, which is light.

• They are filled with water, which makes them float.

• They are filled with helium, which is lighter than the air around it.

• They have a very long string that pulls them up.

What happens to the air around a balloon as it floats higher and higher into the sky?

• There is more air, and it gets thicker.

• There is less air, and it is more spread out.

• The air gets much warmer.

• The air turns into clouds.

If a balloon is not very strong, what might happen to it when it floats very high up?

• It will get bigger and bigger without stopping.

• It will pop because the helium inside pushes too hard.

• It will turn into a bird.

• It will get stuck on a cloud.

What happens to a strong balloon when it floats very high up where it is very cold?

• It will become very soft and squishy.

• It will shatter into many tiny pieces.

• It will fly to the moon.

• It will change color.