This lab report summarizes an experiment to verify Boyle's law regarding the inverse relationship between the pressure and volume of a gas at constant temperature. The experiment involved compressing a gas in a vessel and measuring the pressure and volume at various points. The results showed that as pressure increased, volume decreased, maintaining a constant product of pressure and volume. Key differences between the compression and expansion parts of the experiment were discussed.

1. Koya University
Faculty Of Engineering
Chemical Engineering Department – 2nd stage
Supervised by:
Mr. Ribwar and Mr. Hassan
Prepared by:
Safeen Yaseen Jafar
Ramazan Shkur Kakl
Rivan Dler Ali
Rokan Mohammed Omer
Lab Report
Experiment Name
Boyle's law
Part 2 - Compression
Experiment Date
28/10/2020
Submit Date
4/11/2020

2. Table of Content
Subject Pages
Aim of Experiment………………......………………………………………. 1
Theory/Introduction...…….........…………………………………………….. 2
Methology of Tools...………......…………………………………………… 3
Procedure…..…………………......…………………………………………. 4
Table of Reading.…………………...……………………………………….. 5
Discussion………………………....………………………………………… 6

3. 1
Aim of This Experiment
Our objective of this Experiment is to find relationship between pressure and volume at
constant temperature.

4. 2
Introduction/Theory
Boyle's Law explains how the volume of a gas varies with the surrounding pressure.
Many aspects of scuba diving physics become clear once you understand this simple gas law.
Boyle's Law is:
PV = c
Pressure and volume are inversely proportional to Each other. This means that as the pressure
Decreases, the volume increases, and as the pressure Increases, the volume decreases.
In previous part of this experiment which we called as (Expansion) we increase volume and
decrease the pressure. But in this part of boyle's law experiment which we can called it as
(Compression).
So, this relationship is called Boyle’s Law and makes up Part of the ideal gas law.

5. 3
Methology of Tools 7 8 9
10
1. Vessel 1 for isothermal change of state.
2. Digital displays.
3. Digital display’s way valve for switching between compression and expansion.
4. Heating controller.
5. Digital Displays.
6. Vessel 2 for isochoric change of state.
7. Volume Sensor.
8. Temperature Sensor.
9. Pressure Sensor.
10. Main Switch
OTHERS:
▪ Two 3-way valves

6. 4
Procedure
1. Turn on main switch.
2. Open vent valve.
3. We take two directions to a number one.
4. Turn on compressor until the liquid reach the half of the vessel.
5. Turn off the compressor.
6. Close the vent valve.
7. Don’t change the direction of two 3-way valves until finish the tests.
8. Record the volume and pressure as we see on the digital displays, also we have to
know these records of V and P are under the constant temperature.
9. Repeat these steps five times in every three second.

7. 5
Table of Reading
No. Pressure (bar) Volume (L) PV = Constant
1
0.99 bar 2.75 L ≅ 2.7
2
1.11 bar 2.43 L ≅ 2.7
3
1.2 bar 2.24 L ≅ 2.7
4
1.34 bar 2 L ≅ 2.7
5 1.42 bar 1.88 L ≅ 2.7
*notice these tests are under the constant temperature so we neglected it in table above.

8. 6
Discussion
1. Draw a chart that shows relation between pressure and volume.
2. Discuss the values (P and V)’s in above chart.
The values from table of reading recorded from lab’s activity or lab’s work, so as we see
from these results in this table, the relation between pressure and volume is opposite from
each other. Its mean that in the compression part, we increase the pressure and decrease the
volume.
3. Discuss the difference between compression and expansion parts of this
experiment.
In compression the pressure increases but the volume of the system is reduced. also in
procedure of compression we have the different things like that: after the turning off
compressor we don’t make change in two 3-way valve’s direction until the tests reach end.
But in expansion volume is gradually decrease and the pressure is decrease. In procedure
of this part we have the different thing from part one, after the turning off compressor we
make change in two 3-way valve’s direction, so we change the directions of both 3-way
valves from number one to two.
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
0 0.5 1 1.5 2 2.5 3
Pressure
Volume
(P and V)'s Relation