N5
Physics assignment Nathan Harbinson
Aim
To
investigate the correlation between the pressure and volume in a gas when the
mass is constant. In order to find this we would need to alter either pressure
or volume.
Underlying
physics
Gases are
built up of several particles. These particles are in a state of constant
motion. Because of this, they collide with the walls of their container. These
collisions create pressure. This means that when the volume is altered the
pressure will also change.
Pressure can
be measured using
P = pressure Pa
F = force N
A = area m2
Using this information we know that when area
is decreased the pressure will increase and when force is increased the
pressure will increase.
The Kelvin scale
changes 0 degrees Celsius into -273 degrees kelvin. This theory allows us to
know that the volume of a gas is 0 at -273K this is useful as it allows us to
work out the volume of a gas using temperature.
Method
A fixed mass
was trapped in tube with oil at the bottom. Along the tube was a scale showing
the volume inside. Then using a foot pump we decreased the volume and took a
measurement of the pressure inside the tube using a pressure gauge. We did this
for five values of volume and wrote a table of results.
Air Volume cm3
Pressure 1 (kPa)
Pressure 2 (kPa)
Pressure 3 (kPa)
Average
Pressure
(kPa)
1/v
10
256
253
259
259
0.1
15
180
180
180
180
0.07
20
148
130
130
130
0.05
25
109
100
91
100
0.04
30
80
83
77
80
0.03
Using these
results we plotted and drew a straight line graph. See next page for second source graph.
Analysis
This graph
shows that when volume decrease the pressure increase and vice-versa. This
would suggest that the pressure and volume in a fixed mass are inversely
proportional. My second Source is also a straight line graph going through the
origin. Its shows us that volume and pressure are also inversely proportional.
Conclusion
The aim of
my experiment was to find out if there was a correlation between Volume and
pressure in a fixed mass. My graph and experiment results show that there is a
definite correlation between the two.
Evaluation
In order to
make my experiment as accurate as possible we took three tables of results for
pressure. This in turn meant that we used an average when plotting our results.
This meant our results would be accurate as we would have more values to co-operate.
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