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Experience with candles, balls, cardboard disk. Physical experiments
Entertaining experiences at home / Physics experiments for children
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Place two candles side by side, at some small distance.
Blow into the gap between them. Candle flames lean towards each other. This is because a stream of air passes between the candles and creates a reduced pressure in this gap, and the air, rushing here from the right and left sides, will tilt the flames.
The same experiment can be done with two light (rubber or celluloid) balls suspended side by side on strings. Blow between them - the balls will get closer.
The same result is obtained with two paper strips.
Take a curved tube and a lightweight celluloid ball. You will be able to support the balloon over the tube in a jet of air pressure.
Make a cardboard disc, thread a tube in the center. Hold the disc a short distance from the piece of paper and blow through the straw. It turns out again a phenomenon that would seem at first glance to be contrary to common sense - a sheet of paper, instead of flying away from the disk, on the contrary, will stick to it.
The explanation is also quite simple.
The fact is that the air leaving the tube quickly diverges in all directions, parallel to the cardboard disk. At the same time, pressure is reduced on a piece of paper from the side of the disk. And the pressure of the surrounding air at the same time will support the paper from the other, lower side.
We recommend interesting experiments in physics:
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See other articles Section Entertaining experiences at home.
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| Random news from the Archive Add Magnesium to the Car Body
04.01.2006
Thin rolled steel, from which car bodies are made, is coated with a layer of zinc to protect against corrosion.
Engineers from the Dortmund Center for Surface Physics (Germany) found that it is possible to significantly enhance the anti-corrosion properties of such a coating if magnesium is added to zinc.
In a pilot plant built at the Dortmund Center, a 7-micrometer-thick zinc-coated steel strip passes at a rate of meters per second through a vacuum chamber where magnesium vapor is blown over it. Locks are installed at the entrance and exit of the chamber, the air from which is pumped out by powerful pumps so that it does not penetrate into the chamber. Zinc is covered with a layer of magnesium a few nanometers thick. After additional heat treatment, magnesium atoms diffuse into the zinc surface. The resulting layer is more than ten times more resistant than conventional zinc coating.
In a special chamber, where a fog is created from a five percent solution of common salt (imitation of conditions on a winter road), galvanized steel after five days of stay is almost completely covered with rust.
Magnesium-zinc coating shows the first signs of corrosion only after 50 days. The work is funded by German automotive firms.
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