# Aim: F= force (N) A= area (cm3) The smaller

Aim: to investigate
the relationship between the pressure with a fixed mass of air and the volume
of gas with a fixed temperature.

Underlying Physics:
Pressure is defined as force per unit area. When air is confined to a small
space and the particles will bounce off the walls and off of one another. The
force caused from these collisions is called pressure. The general equation for
pressure is- P=F/A

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P= pressure (Pa)

F= force (N)

A= area (cm3)

The smaller the
surface area the greater the pressure because air is made up out of lots of
small particles so imagine the air has been trapped in a container/cylinder
with a piston or oil. When the piston or oil is moved inwards the air particles
will have less room to move as the volume has been decreased. Due to the
decrease in volume the particle will begin to collide more often because they
have more energy when they so this results in more collision that which creates
an increase in pressure.

Method: We used an
air pump which was connected to a pressure gauge. We then used the air pump to
pressurise the air, which made the oil rise up the reservoir in the pressure
gauge and reduced the space the air has to move and this increased the
pressure. We then took note of the pressure and the volume and repeat the
experiment three times to make my results more accurate, then found the average
pressure.

Pressure 1 (kPa)

Pressure 2 (kPa)

Pressure 3 (kPa)

Av. Pressure (kPa)

Volume (cm3)

1/volume (cm3)

10.3

10.5

10.7

10.5

41

0.0244

11.7

12.0

12.3

12.0

36

0.277

13.8

14.0

14.2

14.0

31

0.0323

15.4

16.0

16.6

16.0

27

0.370

17.9

18.0

18.1

18.0

23

0.0426

I got my second source
from this book:

Title: Higher Core
Physics

Author(s): Geoff
Cackett, Jim Lowrie, Alastair Steven

ISBN: 0 19 941096 0

Page Number:
159

I discovered that
my graph and the graph from my second source agree as they are both straight
line graphs and both lines cut through the origin.

Conclusion: in conclusion
I discovered that the pressure of would increase when the volume of a gas   decreased.