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Experiments on air pressure

January 12, 2012  by: kanduri narasimha  Points: 12   Category: General Science  Earning $0.50   Views: 1638

In this article, I have mentioned the experiments about air experts pressure.

         

Science experiments about air exert pressure:


The below experiments specifies about air exerts pressure.
a) In this experiment, we require a glass bottle, a piece of stiff paper and some water. We have to take a glass bottle and we have to fill it with water. We have to place the piece of stiff paper on the mouth of the bottle. Now we have to keep our palm over the piece of stiff paper and turn the bottle upside down. Now holding it with the other hand, we have to remove the palm carefully. Then the piece of stiff paper does not fall and it does not allow the water to come out because the air exerted its pressure from below.
b) In this experiment, we require a tin can, a nail, a hammer and a bucket half filled with water. We have to take a empty tin can and make several holes to its bottom with a nail and hammer. We have to make another hole at the top of the tin on the curved wall. We have to fill the can with water by dipping it into the bucket of water. Now we have to close the tin lid firmly while the tin is submerged in water. Now, we have to place our index finger over the side hole at the top of the can. On lifting the can out of the water, the water in the can does not drip through the holes in the bottom of the can. Now we have to remove the finger from the side hole, then the water in the can falls down. If we do this again and again, it seems to be a shower with stops in regular intervals.

First, water does not fall from the can because there is no pressure exerted from above. When we remove our index finger from the side hole, then air rushes in the can and it exerts pressure. So, the water starts showering down through holes in the bottom of the can. Showering is stopped when we replace our finger on the side hole because the finger blocking the air pressure in the can once again.
c) This is another experiment on air pressure. In this experiment, we require a handkerchief, a bucket full of water, a glass tumbler and two persons. In this experiment, we have to ask the persons to hold the four corners of handkerchief above the bucket. We have to fill the tumbler with water and pour it over the handkerchief. Then the water pass through the handkerchief down into the bucket. Now, we have to fill the tumbler with water again and cover the mouth of the tumbler with the handkerchief and holds its four conrners attentively with the hand at the bottom of the tumbler. Now turn the tumbler upside down.

When we invert the tumbler, the water forms an air tight sheet with the handkerchief. This sheet does not allow the water to fall down as air pressure exerted from below.

d) This is another experiment on air pressure. In this experiment, we require a ruler and a sheet of news paper. We have to position the ruler on a table in such a way that one third of the ruler extends beyond the edge of the table and two-thirds of the ruler remains on the table. Now, we have to place a sheet of news paper over the ruler, covering maximum part of the ruler on the table. We have to smoothen out the paper so that no air is trapped underneath it. Now we have to try to move the ruler by hitting the ruler out of the table with one of our hands.

But, it is difficult to move the ruler because air is pressing down on the news paper which covers the ruler. The large area of news paper shows that a lot of air which is pressing down on the ruler.
e) This is an experiment about how to increase air pressure. For this experiment, we require a glass bottle having capacity of 750millilitre, some dough, a drinking straw and some water. We have to take the bottle and fill it with the water more than half. We have to insert the drinking straw through the mouth of the bottle so that it dips deep into the water. Now we have to seal the mouth of the bottle with a little dough to make it for the purpose of air-tight. Now, we have to blow into the bottle through the drinking straw for a minute and then withdraw our mouth from the drinking straw all of a sudden.

Then a fountain forms when we remove our mouth from the straw suddenly. This happens due to increase of air pressure which is built up in the bottle which forces the water through the straw like a fountain.
The below figure shows air exerts pressure from below.




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