Atmospheric Pressure Experiments For Kids

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Experiments under pressure
The air we breathe is not only there. It can be used to make amazing things. Mr. Hecker will show you this amazing three experiments.

The air can pump, push eggs into bottles, and even delete thirst. Divers also need air to breathe not only with the atmospheric pressure to determine their speed in setting up and dive.

What can all the air, you can also try out even once.

Here come to three experiments.

Atmospheric pressure experiments for kids 1: Bird Bath
What do you need?

  • 1 drinking glass full of water, milk or juice
  • 1 soup plate
  • 1 teaspoon
  • 1 drinking straw

What do you do with it?
Fill the drinking glass with water, milk or fruit juice. Soda or soda is not so well suited.Place the soup bowl full of vice versa, the drinking glass, so after using the bottom up. Then you turn both – glass plate and – to carefully, so that the glass is upside down on a plate

Make sure that both of you does not slip or fall out of hand. Put the spoon tip under the glass so that a small crack through which something flows out to drink. On the plate is now a puddle, because something has leaked, but not much. Suck the straw to drink something from the plate.

Why is that?
An invisible force keeps the liquid trapped in the glass: the air pressure, indeed! It is only a little liquid out of the glass because some air penetrates through the gap. Once sealed water, milk or juice the gap, it is “tight”. Then the atmospheric pressure on the surface of the liquid, which pushes into the glass.

What’s behind it?
We live on the bottom of a gigantic ocean air. The air surrounding the Earth reaches high above us many miles. At 100 kilometers altitude begins the space, air particles, there are even more in 1000 km altitude.

Even if air is very easy – it’s a gas – it does not weigh anything. On the high altitude the air on earth all of a considerable force, and expresses quite nicely for us. The glass may be ten meters high, the atmospheric pressure around us would be strong enough to hold the liquid in the glass.

The chickens on the farm, for example, drink water from a birdbath. This is a kind of metal bucket on a metal plate, similarly structured, like the attempt.

The metal bucket filled with water and placed upside down on the plate. Of small holes down some water flows out and into the plate, can drink from the chickens.

The water that the chickens wegtrinken is immediately refilled from the reservoir. The farmer must refill with fresh water only once a day. A great idea, or?

Atmospheric pressure experiments for kids 2: Candle pump

What do you need?

  • 1 soup plate with a finger’s breadth of water in it
  • 1 drinking glass (not plastic cups)
  • 1 tealight
  • 1 lighter
  • 1 adult, because this test works with fire

What do you do with it?
Place the candle in the water on the soup plate and set fire to it. After about a minute when the candle is burning well, you stülpst the drinking glass over the tealight.

The candle goes out soon. Of course! Because the oxygen is rapidly consumed by the glass.

No sooner is the candle extinguished, water penetrates into the glass and the candle float up. Finally, the water in the glass is much higher than the outside around it.

Why is that?
The candle burns the oxygen in the air under the drinking glass. The air is heated, because the candle flame is about 1,000 degrees hot.

Once the candle has gone out, cools the air in the drinking glass. Cool air takes up less space than hot, and so the cooled air makes the drinking glass in place so that the atmospheric pressure that pushes outward on the water level, water can push it.

What’s behind it?
This experiment is a true classic. Unfortunately it is often stated incorrectly. In many experimental books say that the candle burns the oxygen and this creates space in the glass, such as lack of oxygen then.

This is wrong. Because the oxygen (O2) disappears when burned not, he is together with carbon from the wax burning to carbon dioxide reacted (CO2). Because this much energy is released, the candle flame is so hot that it glows.

Atmospheric pressure experiments for kids 3: The egg in the bottle

Not every egg fits in a bottle.
What do you need?

  • 1 glass bottle with a large opening (about 3 inches)
  • hot water
  • edible oil
  • 1 (small) cooked chicken (about 4-5 minutes cooking)
  • 1 adult (because of the hot water)

What do you do with it?
Let the adults to pour your instructions a little boiling water into the bottle, shake on it and screw the lid.

Then he should take off the lid and stand the bottle. You carefully place the oiled egg with the tip down on the bottle.

The egg is slowly drawn into the bottle. If you’re lucky, it’s not broken. At best you are prepared before the multiple eggs, which then you have in reserve and can try it several times.

Why is that?

The bulb is different in the bottle: It grows in it!
Quite clear: The air in the bottle, which is by shaking the bottle properly warmed with hot water cools.

Cool cold air but takes up less space than warm air. Therefore, the cooling air is in the bottle the atmospheric pressure outside to meet less resistance and the air pressure forces the egg into the bottle.

Because the atmospheric pressure pushes outward on all sides against the egg, it will hold pretty well in the bottle and remains (mostly) intact.

And how do you get the egg out again?
For this you have to turn the atmospheric pressure conditions. Put the bottle to his mouth as if you want to drink from it.

The egg slides down into the neck and closes it. If you blow into the bottle now, the egg is just up and leaves over the air.

Now in the bottle, a higher atmospheric pressure than outside and the egg is also suppressed. An egg from the bottle out of the way, is getting easier than it hineinzubekommen!