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Experiment to verify the
"Pressure Law" and find the Absolute Zero of Temperature
| 1.
Preparation: |
a) |
Learn the
law. |
|
b) |
Make sure
that you know how to use the kinetic theory to explain why the
pressure of a gas increases with temperature. |
| 2. |
Using the apparatus
shown below, measure the pressure of the air in the flask for as
wide a range of temperatures as possible. |
|
 |
| 3. |
To obtain a wide
range of temperatures, start by adding ice to the water.
Explain why you should keep the temperature of the water
constant for a few minutes before taking each result. |
| 4. |
Analysis of the results. |
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EITHER |
|
Plot a graph of pressure against temperature
using a temperature scale which will allow you to extrapolate
below 0°C to find an estimate for the absolute zero of
temperature |
|
OR (better) |
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Plot a graph of pressure against temperature
using the biggest scales possible. Draw the best fit line and
measure its slope. |
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The equation of the line has the form y = ax + b,
and you are trying to find the value of x which makes y = 0. |
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Using the slope and the co-ordinates
of any point on the best fit line, calculate a value for
the constant, b. When b is known, the value of absolute zero can
be found. |
|
© David
Hoult 2008 |
The
Open Door Web Site