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Thermal Physics
 
Aim: to verify the Pressure Law and find the Absolute Zero of Temperature
See Why a Gas Exerts a Pressure, The Gas Laws
 
Method
The method proposed here assumes you can find apparatus to set up something as shown in the diagram below.
Measure the pressure corresponding to as wide a range of temperatures as possible.
To obtain a wide range of temperatures, start by adding ice to the water.
You should try to keep the temperature of the water constant for a few minutes before taking each measurement of pressure.
 
Analysis of results:
Plot a graph of pressure against temperature on the largest scales possible.
Draw the best fit straight line and find its slope and the intercept on the pressure axis.
The equation of this line has the form
where a is the slope and b is the intercept on the pressure axis
 
To find a value for the absolute zero of temperature, we simply have to find the value of T which corresponds to zero pressure.
When p = 0, we have
 
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