Marvin and Milo

Explore physics the exciting way, by trying out a simple and fun experiment. This month, Thirsty bottle Don't forget to check back next month for the next edition...

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What you need


Glass bottle


Hot water

Room temperature water



Pour some water onto a plate

Fill the bottle with hot water. The water and the bottle will be hot so you might need to ask a friend to help.

Carefully pour the water away and quickly place the bottle upside down on the plate of water. The water will rise up the bottle.

Results & explanation


The hot bottle heats the air inside it. Once the air cools it takes up less space. The air pressure inside the bottle becomes less than the air pressure outside. This forces the water up the bottle.

Read more about thermodynamics on


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