
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 
