Live fish and toy fish. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Live fish and toy fish. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

The fish floats and sinks with the help of a bubble. The same swim bladder, which, of course, you saw more than once when you gutted the fish. But the fish bladder does not communicate with water. It is hidden inside, in the middle of the fish body. How do you manage to maneuver with such a bubble?

The fish makes it very easy. It has no valves or compressed air tanks. Fish also did not study physics. But she is alive, she has muscles. And now, when you need to dive, the muscles compress, squeeze the bubble. Its volume decreases, the fish becomes heavier and goes down. And you need to get up - the muscles relax, dissolve the bubble. It increases and the fish floats up.

This is why dormant or stunned fish float to the surface. After all, her muscles no longer work, they are relaxed, and the bubble is inflated to the limit! You may ask why, in this case, the fish usually tip over on its side? Yes, because the bubble is located in the center of gravity of the body. Live fish always moves its pectoral and ventral fins, maintains the correct position of the body. And the muscles stop working, and the fins stop, the fish falls on its side and so emerges.

"Having studied the experience" of a live fish, you and I can make a toy fish. It will also rise and fall, changing the volume of air in the bubble.

Pierce the egg at both ends and blow out the contents. Close the hole in the sharp end with sealing wax or a piece of paper with BF-2 glue, leave the other open. Draw two big eyes on the shell. Of course, do not paint with watercolors or gouache. Here you will have to take oil paints, or a wax pencil, which is used to write on glass.

From two shreds of bumazea, sew a bag in the shape of a fish. If you take a green or gray fumes - it will be a simple fish, if you take a red or yellow one - it will be golden!

Pull the bag halfway over the egg and glue it with BF-2 glue. Pour enough lead shot into the tail of the bag so that the fish still swims near the surface, but at the slightest push sinks into the depths. Shot is convenient because lead does not rust in water.

Live fish and toy fish

Put the toy fish in a jar of water. From above, tighten this jar with a rubber membrane (at least from a burst balloon or from an old volleyball chamber) and tie it tightly with a thread. The toy is ready!

The head of the fish - an empty egg - plays the role of a swim bladder. But the egg is hard, and the fish is lifeless, without muscles. How to change the volume of air in a bubble? And very simple. Fish don't have muscles, but you do. Here, press the rubber membrane with your hand. The air under the membrane will compress and press on the water. This will push a few drops of water through the hole into the egg. The volume of air in the egg will decrease, the fish will become heavier and dive. Relax the muscles, let go of the membrane - the fish will float up. If the load is well chosen, the fish will dive with the slightest pressure!

Author: Galpershtein L.Ya.

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