2008-05-11

Application of Archimedes' Principle

Hello guys, these are only a few examples of the application of Archimedes' Principle. This examples only serve as a guidance and you should try to search for other examples. :) Hope this helps.

1. Submarine:

A submarine has a large ballast tank, which is used to control its position and depth from the surface of the sea.


A submarine submerges by letting water into the ballast tank so that its weight becomes greater than the buoyant force.

Conversely, it floats by reducing water in the ballast tank.-thus its weight is less than the buoyant force

2. Hot-air balloon

The atmosphere is filled with air that exerts buoyant force on any object.


A hot air balloon rises and floats due to the buoyant force (when the surrounding air is greater than its weight). It descends when the balloon's weight is higher than the buoyant force. It becomes stationary when the weight equals the buoyant force.

The weight of the Hot-air balloon can be controlled by varying the quantity of hot air in the balloon.

3. Hydrometer

A hydrometer is an instrument to measure the relative density of liquids.


It consists of a tube with a bulb at one end. Lead shots are placed in the bulb to weigh it down and enable the hydrometer to float vertically in the liquid.


In a liquid of lesser density, a greater volume of liquid must be displaced for the buoyant force to equal to the weight of the hydrometer so it sinks lower.

Hydrometer floats higher in a liquid of higher density.

Density is measured in the unit of g cm-3.


4. Ship


A ship floats on the surface of the sea because the volume of water displaced by the ship is enough to have a weight equal to the weight of the ship.

A ship is constructed in a way so that the shape is hollow, to make the overall density of the ship lesser than the sea water. Therefore, the buoyant force acting on the ship is large enough to support its weight.

The density of sea water varies with location. The PLIMSOLL LINE marked on the body of the ship acts as a guideline to ensure that the ship is loaded within the safety limit.

A ship submerge lower in fresh water as fresh water density is lesser than sea water. Ships will float higher in cold water as cold water has a relatively higher density than warm water.



5. Fishes

Certain group of fishes uses Archimedes’ principles to go up and down the water.

To go up to the surface, the fishes will fill its swim bladder (air sacs) with gases (clever isn't it?).

The gases diffuse from its own body to the bladder and thus making its body lighter. This enables the fishes to go up.

To go down, the fishes will empty their bladder, this increases its density and therefore the fish will sink.

6. FLIP – Floating instrument platform.
This is a research ship that does research on waves in deep water. It can turn horizontally or vertically. When water is pumped into stern tanks, the ship will flip vertically.

The principle that is used in FLIP is almost similar with the submarines. Both ships pump water in or out of tank to rise or sink.

37 comments:

Anonymous said...

can u plz list down da application for Cartesian Diver n Plimsol line in a ship with the help of graphics, diagrams an pictures.. im doin a project ^^

savithri said...

could u give sum more applications because i'm doing a proj

Drishya said...

i totally agree wid savithri....:P
pls give sum more info wich at least luks like important.!!!!!!!

Anonymous said...

i learn about this princples today.

Anonymous said...

pls give more info onapplications

cisile1 said...

thanks!!!

dheeraj said...

hey u can find them in hte 9th class icse physics concise text book

Anonymous said...

very less info I had to make a project on this topic but there is so less infomation man !!!!!!!

Anonymous said...

i totally agree with Savithri and Drishya.plz add more applications.this is Sindhura

Anonymous said...

please put some other examples related to daily life other than the textbook examples...for bouyant forca or archimedes principle

Anonymous said...

i agree with all give more applications

Anonymous said...

i agree with alllllllll

Anonymous said...

plz post more as well as detailed applications!!!!

Anonymous said...

Would really appreciate if if you added more info and applications. Need to do a project.

Anonymous said...

could u give sum more informations so that i can do my project

AK96 said...

plz add more info this is not enough but yet good work man:)

Rishi Barath said...

2 more application would be better...... thnx anyways

Anonymous said...

nice information...thanks!! :) Really helped my project!!

Anonymous said...

Quite brief

Anonymous said...

blah blah!

Anonymous said...

blah blah!

daisy said...

the information is few, but it is accurate! you can take these small infos and search for its deatails in google. thanks anyway!!
--- DAISY=)

DAISY B.D said...

the info is few, but its accurate though!! you can take these small infos and take its details in google!
Thanks anyway BUdDy!!
- DAISY=)

DAISY B.D said...

the info is few, but its accurate though!! you can take these small infos and take its details in google!
Thanks anyway BUdDy!!
- DAISY=)

Anonymous said...

THANK YOU

Anonymous said...

GREAT! FOUND IT USEFUL THANXX !!!!!!!!!!

Anonymous said...

nic examples i m totally satisfy...... it help me in my project thnx.................who ever post these examples.:)

AISHU said...

it is a very nice information. but as most of them said, i too need a lot more information on this as i have to do a project on the applications of archimedes principle.i would be very grateful to u if u provide me with a lot more information.

Binita said...

hey!! guys really dis is vry less info to do a project..

eleanor said...

okay to everyone who is doing a project, i just wrote an entire two page report on archimedes principle and this website is where i go the majority of my information. So maybe if you looked more into the details and did other searching to assist your needs then your project would practically already be made for you...

Anonymous said...

VERY INORMATIVE AND BEAUTIFULLY PRESENTED. KEEP IT UP!

naman agarwal said...

its the most fabulous site for physics.

Anonymous said...

a very good website for students to study and understand the archemedes principle and physics

Anonymous said...

i too agree with all.plz give more information on this topic and thnx for those mentioned above

Anonymous said...

THANKS ALOT,I LIKE THIS SITE,IT HELPS ALOT WHEN IT COES TO RESEARCH.

sruthi baburaj said...

you can give some more applications
but this is very good informative and learnable.

sruthi baburaj said...

this site is very useful; you can include some more information.but any way it is good.