Heating Up Air!

Changing State of Mater - Science Experiment

Description of the experiment

As its temperature rises, air starts to act a little differently. Find out what happens to a balloon when the air inside it heats up with this fun science experiment for kids.


Our aim is to heat up air using a balloon and hot water.


The balloon will inflate.


  • Empty bottle
  • Balloon
  • Pot of hot water (not boiling)


  1. Stretch the balloon over the mouth of the empty bottle.
  2. Put the bottle in the pot of hot water, let it stand for a few minutes and watch what happens.


According to our experiment you need lots of boiling water to make the balloon blow up completely. The first thing we needed to do in our experiment was getting the boiling water and putting it in a pot. From there we put the bottle with the balloon attached to the mouth of the bottle and put it in the boiling water. As soon as we did this the bottle started to get foggy and the balloon started to blow up because the heat from the boiling water heated up the bottle and the air got pushed up into the balloon. It didn't blow up lots but it blew up about 1 quarter of the way. After a few minutes the balloon started deflating and the air drifted out. It didn't blow up completely because we didn't have enough boiling water.


Our hypotheses was that the balloon would inflate because the heat from the boiling water would rise and blow up the balloon. Our results do support our hypotheses. I think that our experiment went really well apart from not having enough boiling water so the balloon didn't blow up as much as we hoped it would.
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This is a button for lots of different experiments including this one!