
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. 

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) 

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 coordinates
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. 

