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J. Perelman
"Entertaining physics". Book 1.
Chapter 5. Properties of liquids and gases

WATER IN A SIEVE

It turns out that to carry water in a sieve is possible not only in the tale. Knowledge of physics will help to fulfill this classically impossible thing. For this we need to take a wire sieve 15 centimeters in diameter and not too small cells (about 1 mm) to dip the net into the melted paraffin. Then remove the sieve from paraffin: the wire will be coated with a thin layer of paraffin, barely noticeable to the eye.

Sieve remained a sieve - it has a through hole, through which freely passes a pin, but now you can, literally, wear it with water. In such a sieve is kept relatively high layer of water, not spilling through the cell; it is only necessary to carefully pour the water and to protect the screen from bumps.

Why water does not shed? Because, without moistening the paraffin, it forms in the cells of the sieve thin film which is convex downward, and retain water.


Why water is not discharged from waxed sieve.

This waxed sieve can be put on the water, and it will stay on it. Therefore, it is possible not only to carry water in a sieve, but to swim for it.

This paradoxical experience explains a number of common phenomena, to which we have grown too used to think about their reason. Smolenice barrels and boats, the lubricating fat tubes and sleeves, staining with oil paint and generally covering oily substances all those items that we want to make impervious to water, and proteinuria fabrics - all this is not that other, as a manufacturer of sieve like now described. The essence of the case, and here and there one and the same, only in the case of sieve it acts in an unusual way.

Entertaining physics J. Perelman

 




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