What gases does air consist of? Drawing, description

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What gases does air consist of? Children's Science Lab

Children's Science Lab

Directory / Children's Science Lab

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For experience you need:

adult assistant;
glass jar;
candle;
water;
coins;
large glass bowl.

What gases does air consist of?

1. Have an adult light a candle and put paraffin wax on the bottom of the bowl to secure the candle.

2. Carefully fill the bowl with water.

3. Cover the candle with a jar. Place stacks of coins under the jar so that its edges are only slightly below the water level.

4. When all the oxygen in the jar has burned out, the candle will go out. The water will rise, taking up the volume where oxygen used to be. So you can see that there is about 1/5 (20%) oxygen in the air.

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Random news from the Archive

Prosthetic arm rocket engine 28.10.2007

US engineers have adapted a rocket engine for a prosthetic arm.

"We have created an artificial hand that resembles a human hand much more in its work and strength than all existing prostheses. In addition, it weighs about the same as a human hand," says Professor Michael Goldfarb from Vanderbilt University, leader of the work. (USA).

Until now, prosthetic arms have run on batteries - their energy was enough to provide a limited set of functions. However, for a complex hand that could, for example, move its fingers, the battery turned out to be weak.

Therefore, scientists from Goldfarb's group decided to adapt a rocket engine for the prosthesis. This was done by specialists from Johns Hopkins University - the engine became the size of a pencil. And it works on hydrogen peroxide, which decomposes with a catalyst. The result is pressure that opens and closes a series of valves, and the hand and fingers move. A small vessel of fuel, which is placed in the forearm, is enough to power an artificial arm for 18 hours.

When creating the hand, two problems arose. The first is warmth. They coped with it by covering the hottest parts with special plastic. The second is the exhaust: when the peroxide decomposes, water is obtained, which must be put somewhere.

The authors of the work applied an ingenious solution: water passes through a porous surface, and its amount approximately corresponds to the volume of sweat emitted by a human hand.

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