About a paper pan, a slave with a fan and injections. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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About a paper pan, a slave with a fan and injections. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

From a tin can make a tripod, as in our drawing. From a sheet of thick paper, fold the box and secure its corners with paper clips. Pour some water into the box and put it on a tripod, and substitute a lit candle from below. All this construction should be in a pan.

The flame of a candle licks the bottom of a paper pot. Now, now the pan will burn and the water will pour out! But... nothing like that happens. Soon the water boils, but the paper is still intact. And only when all the water boils away, the paper pan will flare up and turn into ashes.

About a paper pan, a slave with a fan and injections

It turns out that boiling water somehow cools the paper? Yes it is. If you had a suitable thermometer, you could make sure that while the water is boiling, its temperature does not rise above 100 °. It was the temperature of boiling water that was agreed to be taken as 100 °. Well, paper at this temperature still does not light up. Boiling water takes away excess heat from it.

Even if the water does not boil, but simply evaporates, it still creates cold. Try pouring warm water on your hand - it will immediately become cold, especially in the wind.

In ancient Egypt, in order to get cold water in the heat, they used an interesting method. Water was poured into a porous vessel. Water slowly seeped through the pores, the vessel "sweated". The leaked water evaporated. And in order for the evaporation to go stronger, a slave with a fan was assigned to the vessel. The slave created the wind, the evaporation increased, and the water in the vessel cooled rather quickly. The vessel "sweated" in quotation marks, the poor slave was really sweating. But at the same time he produced cold!

About a paper pan, a slave with a fan and injections

By the way, the same method of cooling is used in your body. When you are hot, you sweat and cool off by evaporating sweat.

Well, now about injections. Brrr! At this very word, some, as they say, have a chill on their skin. But when your skin is rubbed with alcohol or ether before an injection, it cools down in the most direct and literal sense. Indeed, it turns out frost on the skin.

You know that your body temperature is about 37°. Well, the ether boils at a temperature of only 35 °. Once on the skin, it boils and cools it, just like in our experiment, boiling water cooled a paper pot. Alcohol boils at a higher temperature: 78°. Therefore, it does not cool the skin as much as ether, but still stronger than water.

Author: Galpershtein L.Ya.

We recommend interesting experiments in physics:

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