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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.

Using the apparatus shown below, measure the pressure of the air in the flask for as wide a range of temperatures as possible.


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.
Plot a graph of pressure against temperature using a temperature scale which will allow you to extrapolate below 0C to find an estimate for the absolute zero of temperature
OR (better)
Plot a graph of pressure against temperature using the biggest scales possible. Draw the best fit line and measure its slope.
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.
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.



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