How to pour water with air. Fun physical experience at home

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How to transfer water using air. Physical experiments

Entertaining experiments in physics

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There are times when you need to pour liquid from one container to another. What if the container with the liquid has a narrow neck, and it turns out that for some reason it cannot be tipped over for pouring? This is where an invisible assistant comes in handy - atmospheric pressure.

Take a curved rubber or glass tube, fill it all with water and immerse it in the upper and lower vessels, placed so that the liquid levels do not lie on the same horizontal plane. A bent tube open on both sides is called a siphon.

How to pour water with air

The liquid in the vessels, experiencing atmospheric pressure and obeying this force, will flow into the lower vessel.

If the distance from the top of siphon A to the nearest level B is very large, the pressure of the liquid column will be greater than atmospheric pressure. The siphon will not work. In our experience, this should not be feared, since this is only possible if the distance AB is equal to 760 mm (for mercury) or 10,34 m (for water). After all, we know that a column of mercury at exactly this height can balance atmospheric pressure. Water is almost 13,6 times lighter than mercury, which means that the water column should be the same number of times higher than the mercury column.

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Comments on the article:

Victor
Air pressure has nothing to do with it. There is a level difference in the vessels. This is easy to verify. Lower the lower vessel or raise the upper one and the liquid will flow faster. And it will flow until the levels are equal.

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