This document summarizes a chemical engineering experiment on lifting force. The experiment aimed to find the lifting force on immersed bodies in liquid. Three bodies made of aluminum, brass, and polyoxymethylene were immersed in water and their weights measured both in air and water. The volume displaced and lifting force were calculated and compared to theoretical values. The discussion analyzes the differences between calculated and measured values and explains why a body's weight is less in water than in air due to lifting forces.

1. University of Koya
Faculty of engineering
Chemical engineering department
2nd
stage 2015-2016
Title : Lifting Force
Name : Zhyar Arsalan Abdulrahman
Group : A1
Date of EXP : 10/11/2015
Date of SUB : 17/11/2015

2. Table of content
1- Aim of experiment……………… page 1
2- theory …………… page 2
3-Procedure ……………… page 3
4-tools……………… page 4
4-Table of reading ……………… page 5
5- Table of calculating: ……………… page 6
6-Discussion ……………… page 7
7-Refrence ……………… page 8

3. Aim of experiment:
Finding the lifting force on an immersion body in a liquid

4. Introductions of theory:
When a body is immersed in a liquid, a
lifting force FA acts upon it which
corresponds to the force due to weight of
the displaced liquid:
FA =𝝆. g . V = w . Vdis ……….. (1)
V - Volume of immersed body = Volume of displaced water
𝝆 - Density of liquid (  Water = 1g/cm3
)
The lifting force FA is always directed upwards, and thus brings
about an apparent weight loss of the immersed body:
FG , water = FG - FA ……………(2)

5. Procedure :
*Fill the overflow vessel 1 with water until the liquid level h is precisely
below the outlet pipe.
*Position the empty measuring cup 3 underneath the outlet pipe.
*Weigh out the three bodies 2 made of aluminum, brass and
polyoxymethylenePOM using the spring balance: Force due to weight
FG for each body.
*Completely immerse the body suspended on the spring balance in
the overflow vessel:
Read off the displayed weight FG, Water
Read off the overflowed water volume V.

6. Tools:
1-body
2- container
3- stand
4- water

7. Table of Readings:
No. Material of the
body
FG
(N)
FG,water
(N)
Volume
displaced
(Vdis)(ml)
1 Aluminum 2.3 1.45 90
2 Brass 4.65 4.1 59
3 Polyoxymethelen 1.25 0.38 90

8. Table of calculating:
No.
Material of the
body
FG
(N)
FG,water
(N)
FA
(N)
FG,water,th.
(N)
1 Aluminum 2.3 1.45 0.882 1.41
2 Brass 4.65 4.1 0.578 4.072
3 Polyoxymethelen 1.25 0.38 0.882 0.368

9. Discussion:
1-Discuss the differencebetweenthe values of the calculating and readings. ?
The value of reading is contain FG and FG water And V dis weobtain by practical step first
read the FG in air (aluminum or brass or polyoxymethylenePOM) and the FG water and
Volume displacement , but calculating we need fining the FA and by theoretical step
find the FG water and compare with the result I finded in practical need the number
both is near .
2-Why is the weight of the body in the air greater thanthe weight of it in the water?
Because a body is immersed in a liquid, a lifting force FA acts upon the body
after the wight is decreased in water .
3-What is happening if the weight of the body in the water (FG,water) becomes zero.
If body becomes zero must be the bodystay at top or goes up to top

10. Refrence :
In exp lab and slide share In google