Tin can watch. Drawing, description

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Tin can watch. Children's Science Lab

Children's Science Lab

The clock you see in the picture has neither gears nor a pendulum. They are replaced by liquid. Making this clock is a simple matter.

Take a tin can 50 mm high and 100 mm in diameter, rinse it thoroughly and then divide it into 6 equal sectors with tin partitions (see Fig.). Before soldering the partitions, make holes in them with a needle of 0,3 mm. From above, between the partitions, solder 6 sectors cut out of tin. And put a tin circle with a diameter of 25 mm on them and also solder.

Tin can watch

Make 3 mm holes in the center of the can on both sides and insert a wire axle into them. Solder the axle on both sides.

Pour filtered kerosene into the jar. Kerosene is poured less than half through a hole made on top, which is then sealed.

Place the can with the axle on a metal bracket, in which you saw holes for the axle, and attach the bracket to the wooden post.

Tie a thread with a weight to the ends of the axis. Take a small jar of sand as a weight. "Start" the watch by rotating the jar. When lowered, the weight will cause the can to spin very slowly, as the kerosene does not easily seep through the tiny holes.

Tin can watch

The amount of sand must be selected empirically.

The bank must make one revolution in 1 hour. If you stick paper with 60 divisions on the body of the can, then each of them should be equal to 1 minute. Follow the real clock to see how fast the jar turns.

When you adjust the stroke, also stick a paper strip on the rack. With each full turn of the can, the weight will drop a few millimeters. The distance traveled in one revolution will correspond to one hour. Mark the scale and then the arrow attached to the weight will show the hours.

Author: A.Abramov

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Record of the lowest artificially created temperature 28.09.2021

Physicists from Germany have managed to get the lowest temperature recorded in the history of science, just 38 picokelvins, 38 trillionths of a degree above absolute zero. Their experiment used the free-falling process of a quantum gas cloud and turning the magnetic field on and off in order to slow down the atoms of the gas almost to a complete stop of their thermal motion.

The point of absolute zero, -273.15 degrees Celsius, is the lowest temperature that can be obtained according to all the canons of thermodynamics. At such a temperature, the thermal motion of atoms stops completely and these atoms cease to have any kinetic energy, which should lead to the appearance of very strange effects. However, reaching the point of absolute zero and below is unattainable in practice due to the fact that it is physically impossible to take absolutely all of their kinetic energy from atoms.

However, scientists are constantly trying to get closer to the point of absolute zero, a few years ago scientists from Harvard successfully performed the "coldest" chemical reaction at a temperature of 500 nanokelvins, 500 millionths of a degree above absolute zero. Somewhat later, experiments were carried out at the Cold Atom Lab aboard the International Space Station at a temperature of 100 nanokelvins.

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