Why does a sprayer work? Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Why does a sprayer work? Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

With atomizer you can spray cologne in the room, varnish a drawing, decorate a poster or a wall paper beautifully. All this is so. But why does this simple device still work? Why do water, cologne, nail polish rise up the vertical tube?

Maybe capillarity drives them up? No, the tube is too wide, and the liquid only rises through it when you blow. If the tube is glass, this is especially clearly visible in it.

The answer will tell you a very simple experiment. Cut off a narrow strip of thin paper and take it by one end. It is clear that the other end will hang. Come on, bring your hands to your mouth and blow hard over the strip. Pfft! Look, the strip flew up, it stretched out horizontally and fluttered like a flag in the wind! As long as you blow, the strip stays on.

Why does a sprayer work?

There is no need to talk about any capillarity. There can be only one reason: a jet of air creates suction. Flying over the strip, she pulls it up. Flying over the hole of the tube, it sucks water, and then, of course, splashes it. Therefore, the invisible man spits.

Scientists try to check every conclusion again and again. You, too, can once again be convinced that the jet creates suction. To do this, make an experiment with an old spool of thread.

Roll a sheet of notebook into a narrow tube and insert it inside the coil. Cut out a circle with a diameter of 3 cm from smooth cardboard and stick a pin in the center of it. The device is ready! Now take the tube with the coil at the end into your mouth, and from below attach a circle to the coil so that the pin goes inside the tube. Blow well into the tube. Maybe you were waiting for the circle to fly off the reel? Nothing like this!

Why does a sprayer work?

While you are blowing, the circle will not fall: it will stay under the coil! Why? It is clear: it is sucked in by an air jet fanning out from the coil. The pin in this experiment does not stick into anything. It is only needed to keep the circle exactly under the coil. Otherwise, he can wag to the side and fall. After all, there will no longer be a jet, there will be no suction.

Finally, another experiment with the suction action of the jet. You may have seen a funny target in the shooting gallery - a celluloid ball dancing in the fountain jet. Why does this ball not fall, does not fly out to the side? Yes, because the jet creates suction. It is worth the ball to move, say, to the right - and almost the entire jet of the fountain will be to the left of it. She will suck the ball to the left, pull it into the fountain again!

You can do a similar experiment with an air jet. Only a celluloid ball will be difficult to keep in the air. Better take a ball of elderberry pulp, foam, plastic sponge. The diameter of the ball is about 1 cm. Glass or metal tube about 25 cm long bend at a right angle. You already you know, how to do it.

Why does a sprayer work?

Put a coiled wire on the short end of the tube. Put the ball into this spiral and blow into the long end of the tube, slowly at first, then more and more strongly. The ball will dance in the air stream!

Author: Galpershtein L.Ya.

We recommend interesting experiments in physics:

▪ circus act

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▪ How many reflections are in the mirror?

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