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Experiment to verify Charles’ Law
and find the Absolute Zero of Temperature
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Warning! |
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This method usually
gives fairly bad results but if you are asked to describe an
experiment to verify Charles’ law in an examination, it will
do! Try to think of the most probable source of error in the
experiment as described below. |
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Set up apparatus as shown in the
diagram below. The law will be verified by plotting suitable
graphs. |
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Using this apparatus, the
temperature of the gas can not be measured directly. We will
assume that the temperature of the gas is the same as the
temperature of the water. The volume of the gas will not be
measured but we will assume that the tube is of uniform
cross-sectional area. This means that changes in volume are
directly proportional to changes in the length of the air
column. |
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You should be able to explain |
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- how the results are analysed to
verify the law |
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- why the gas is kept in the tube
using concentrated H2SO4 |
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- how this apparatus ensures that the pressure of
the gas remains constant during the experiment. |
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© David
Hoult 2008 |
The
Open Door Web Site