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Experiment air2:
Influence
of pressure on the volume of air
* Left photo: Three-quarter fill
a 100-ml vial with water.
* Add 0.3 ml of water to a 1-ml vial.
* Place the small vial bottom-up into
the big one.
* Close it by a stopper punctured by a
20-ml syringe with
an injection needle.
* Press air from the syringe to
the air locked above the water.
* Right photo: Disconnect the needle
from the syringe to remove the air from the syringe, reconnect the syringe
to the needle.
* Suck from the air locked above
the water into your syringe.
Observation left:
The volume of the air bubble in the small vial is reduced by the
positive
pressure put on the water.
Observation right:
The volume of the air bubble in the small vial increased due to
the negative pressure put on the water. So
water is pressed out of the small vial resulting in its floating.
Explanation:
As the water in the vial is not compressible, the positive and the negative
air pressures are transferred to the air bubble in the small vial reducing
and increasing its volume.
(You
can feel on your eardrums that the air pressure changes while
you are quickly moving on a mountain or back).
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last modification: 23.01.2001
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