Your homemade hot air balloon won't fly into the air, I'm afraid...
but it will be a great chance to learn about how temperature makes air expand and is great fun too.
Plus all you need is a balloon, plastic bottle and a pint glass to get started!
STEP1 - Let's get going! Half fill your pint glass with very hot water.
(Make sure you've got adult supervision for this one!)
STEP2 - Next up, pop your deflated balloon over the top of your bottle, as shown.
STEP3 - Now to fill your hot air balloon up! Submerge the bottle into the glass of hot water and now the waiting begins...
Slowly but surely your hot air balloon will start to fill up!
It's all to do with the expansion of air.
When you first put the balloon over the top of the bottle the air inside is at regular air temperature.
Once that bottle is submerged in the hot water the air inside the bottle starts to heat up.
As the air gets hotter those air molecules get more and more energy and the air expands and blows up you hot air balloon!
If you like fun science experiments then you'll love this FREE Science experiment book....
It's packed full of awesome experiments you can do at home with "stuff" you've already got.
Your FREE Science experiment book is:
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