We heat the water. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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We heat the water. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

I hope you still have the apparatus in which we recently heated the air? Yes, yes, the same one: a bottle with a cork and a straw. Now we use it for a new experience. We will no longer heat air, but water.

This time, fill the bottle with water all the way to the top, to the rim of the neck. Pull the tube up and plug the bottle with a cork. The excess water displaced by the cork will rise through the tube. Let it be installed there at a height of 1-2 cm above the cork. If there is more, lay off. It’s good to tint the water with ink here too.

Now the water in the bottle needs to be heated. But here already the warmth of your hands is not enough. You will have to install the bottle in a pot of water, placing two sticks so that there is also a water layer under the bottom of the bottle, and put the whole structure on fire. This is called "heating in a water bath". You can’t put the bottle directly on the fire: it will burst.

We heat the water

Keep an eye on the water level in the tube. I hope you didn't forget to tint the water with ink this time too? Look: the level has dropped a little ... What is it, does water shrink when heated? But don't jump to conclusions. The water level in the tube crept up again and rises further and further. He is now taller than he was in the beginning.

This means that water expands when heated. Well, why did the level go down in the first place? Can't you guess? Yes, because the bottle was the first to heat up and also expanded. And then the heat came to the water!

Author: Galpershtein L.Ya.

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