If you have an inquisitive child who is constantly trying to discover inventions, then help him with this. Offer to make a small vacuum pump from improvised materials, and then carry out cognitive experiments together.
So video homemade:
To make a vacuum pump, we need:
- 3 PVC tubes, 4 mm in diameter;
- 2 valves for an aquarium, costing about 15 rubles;
- tees worth 10 rubles;
- a syringe, it is advisable to use 5 cubes.
To make a vacuum pump, we take 3 PVC tubes with a diameter of 4 mm and attach them to the tee. The tube should sit tightly on the tee and not slip out even with very high pressure.
The third tube we will connect the syringe and tee. The larger the syringe, the greater the effect. As previously mentioned, it is preferable to use a syringe with 50 cubes, and if you find 100 cubes, it will be even better.
The next turn for the valves. Arrows should be drawn on them and written in out. The side on which the arrow shows us we must insert into the silicone tube.
The second valve should already be inserted not with the arrow into the tube, but with the arrow from the tube. It turns out that the arrows on the two valves should not look at each other.
Here we have assembled a simple vacuum pump, now you can try to pump ordinary water from one cup to another.
To do this, we need to place one valve in a cup with water, and the second valve in an empty cup and now we pump water with translational movements. The smaller the syringe, the more translational movements you will have to make.
A vacuum pump can not only pump water, but also pump out air from an ordinary plastic bottle (empty, of course). To do this, we make a small hole in the cap of the bottle and insert a valve there that sucks in air.
By translating back and forth, we pump air out of the bottle. If you want the other way around so that air flows there, simply change the valve and make the same progressive movements, continuing to pump air there.