What is Archimedes Principle explain with example?

Archimedes Principle with example explained below elaborately

The principle of Archimedes is related to the energy applied to an object by the surrounding fluid. This applied energy reduces the total weight of the liquid-soaked substance. In this article, let us get acquainted with Archimedes’ system.

The principle of Archimedes states that :

The upward buoyant force that is exerted on a body dipped into a fluid, whether partially or fully submerged, is equal to the weight of the fluid that the body displaces and acts in the upward direction at the center of mass of the displaced fluid’ 

The amount of thrust force is provided by Archimedes’ law.When an object is immersed partially or completely in a liquid, the weight loss appears to be about the same as the weight of the liquid being moved by it.

Definition of Archimedes Principle

States that the weight due to the gravitational force is opposed to the thrust given by the liquid.The substance inside the fluid only feels the full force acting on it as a weight. Because the actual gravity is reduced by the height of the liquid, the object feels like its weight has been reduced. The apparent weight is given:

Visible weight = Object weight (air) – Trust force (buoyancy)

Archimedes’ policy tells us that weight loss is equivalent to the weight of a liquid being absorbed.

Archimedes’ law states that the force moving in an object is equal to the weight of the liquid being moved by the object. According to statistics, it is written:

Fb = ρ x g x V

When Fb is a moving force, ρ liquid density, V is less volume, and g acceleration due to gravity.

What is Archimedes Principle explain with example?

Archimedes Principle Derivation

The mass of the liquid displaced is.

Mass = Density × Volume = ρ× V

This is because density (ρ) is defined as

Density,ρ= Mass/Volume = M/V

Thus the weight of that displaced liquid is:

Weight = Mass × Acceleration due to gravity

W = M × g= ρ × V × g

Therefore, from Archimedes’ policy, we can write:

Explicit weight loss = weight of water removed = ρ × V × g

from the Archimedes principle, we can write:

The apparent loss of weight = weight of water displaced = ρ×V×g

Thus, the Thrust force is,

Thrust =ρ × V × g

When ρ is the concentration of liquid and V is the volume of the liquid removed.

Thrust force is also called buoyant force because it is responsible for floating objects. Therefore, this equation is also called the buoyancy law.

Archimedes Principle Examples-

1. Calculating the resulting force, if a metal ball of radius 6 cm is dipped into water.

Ans: here,

Radius of metal ball = 6 cm = 0.06m

Volume of metal ball, V = 43πr343πr3

V = 43π0.06343π0.063

∴V = 9.05 × 10-4 m3

water density ρ = 1000 kg.m-3

Acceleration (due to gravity), g = 9.8 m.s-2

From Archimedes principle law we get,

Fb = ρ × g × V

Fb = (1000 kg.m-3)(9.8 m.s-2)(9.05 × 10-4 m3)

∴Fb = 8.87 N

2. Calculateing the buoyant force, if a floating object is 95% submerged into water. The density of water is 1000 kg m-3.

Ans: here, 

water density, p = 1000 kgm-3
From Archimedes principle formula,
Fb = ρ × g × V


Vb × ρb × g = ρ × g × V


ρ,g, and V are the density, acceleration due to gravity, and volume of the water

Vb , ρb , and g are the volume, density and acceleration due to gravity of body dipped

Rearranging the equation


Since, 95 percent of the body is immersed,

0.95 × Vb = V

∴ ρb = 950 kgm-3

Archimedes Principle Experiment

Take a bowl full of water until you reach the mouth.

For this purpose we take any solid object which like and measure its weight using the spring balance. Note this below.

What is Archimedes Principle explain with example?|Objects that float and sink in water

Keep the item mixed with the spring equality and immerse it in water. Just make confirm that the spring equality is not immersed.

Now, underline the weight shown by the spring balance. You will notice that it is small. Some of the water will be transferred to a bowl.

Collect this water and measure it. You will find that the weight of the water will be exactly the same as the weight of the object!

Applications for Archimedes Principle

The following is the application of the Archimedes system:


The reason why submarines are always submerged is because they have a ballast tank that allows water to enter which submerges the submarine as it is heavier than the moving force.

Hot air balloon:

The reason why hot air balloons rise and float in the air is because the moving energy in a hot air balloon is less than the surrounding air. When the leaking power of the hot air balloon increased, it began to drop. This is done by changing the amount of hot air in the balloon.


A hydrometer is a tool used to measure liquid-related congestion.Hydrometer contains lead shots that make it float directly in the liquid. When the hydrometer goes down, the hydrometer reduces the congestion of the liquid.

Find out why something is floating or sinking

Learn what is the conditions of object in water will float or sink.

When the weight of an object is less than that of the liquid removed, the object rises, as in the case of a wooden block under water or a helium-filled balloon released into the air. An object that is heavier than the amount of liquid that moves, although immersed when released, has a clear weight loss equal to the weight of the removed liquid. In fact, on some accurate scales, adjustments need to be made to compensate for the effects of ambient air movement.

Motivational force, always in opposition to gravity, yet caused by gravity. Fluid pressure rises sharply due to the weight (gravity) of the above liquid. This increasing pressure applies force to an underwater object that rises in depth. The result is buoyancy.


The weight of the vessel operates in the center of the force of gravity (G). It opposes movement — the displacement force — upward in the center of the action (B). When the ship is stationary (on the left), the armies face each other. When the vessel is moving on the heels (right), the B shifts to the lower side. Buoyancy then operates with a metacentre (M), point to the center line of the vessel above G.

Archimedes Principle Lab Report

Purpose: To verify Archimedes’ principle, which states that any object, wholly or partly immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object.


  • Spring balance
  • Graduated cylinder
  • Water
  • Object to be tested (e.g., a metal ball, a wooden block, a potato)
  • Procedure:
  • Measure the item’s weight in the air after hanging it from the spring balance.
  • Up to a certain capacity, fill the graduated cylinder with water.
  • Make sure the item is thoroughly immersed when you drop it into the graduated cylinder.
  • Keep track of the new water volume in the graduated cylinder.
  • Subtract the end volume from the beginning volume to determine the amount of water that the item has moved.
  • Calculate the buoyant force on the object using the following equation:
  • Buoyant force = density of water * volume of water displaced * acceleration due to gravity

Compare the buoyant force to the weight of the object in air.


ObjectWeight in air (N)Volume of water displaced (cm³)Buoyant force (N)
Metal ball0.5250.25
Wooden block0.3150.15


ObjectBuoyant force / Weight in air
Metal ball0.5
Wooden block0.5

The results of the experiment show that the buoyant force on the object is equal to the weight of the water displaced by the object. This verifies Archimedes’ principle.


An essential tenet of physics is Archimedes’ principle, which clarifies why certain objects float and others sink. A boat, for instance, floats because it moves a lot of water. The boat can float because the buoyant force acting on it is equivalent to the weight of the water being displaced.

Numerous practical uses may be made using Archimedes’ idea. The design of submarines and other submersibles, for instance, uses it. By varying the volume of water they move, submarines may modify their depth.

Sources of error:

The outcomes of this experiment might be impacted by a few different types of error. The challenge of estimating the amount of water the item displaces is one source of mistake. The challenge of confirming that the item is entirely submerged is another cause of inaccuracy.

Use a big graduated cylinder to properly measure the volume of water displaced in order to increase the experiment’s accuracy. Additionally, it’s crucial to confirm that the item is fully immersed by gently lowering it with a glass rod.

Frequently Asked Questions  about Archimedes Principle – 

What does the Archimedes Principle say?

The principle of Archimedes states that a substance immersed in a liquid, in whole or in part, feels a rising force equal to the force and gravity of a dissolved liquid.

Who got the Archimedes Principle?

The Greek mathematician Archimedes discovered the system of Archimedes.

How does the Archimedes system work on ships?

Archimedes went on to make further experiments and came up with an idea of   how the ship would float when the lifeboat was about the size of a ship and anything would float when it was formed to remove its water weight before landing the point at which it will sunk.

Where is the principle of Archimedes used?

The Archimedes principle is applied to the design of ships and submarines. Hydrometers are based on Archimedes’ policy.

How can the Archimedes Principle be used to determine congestion?

The weight of the removed liquid is equal to the moving force in an underwater object. The weight divided by the volume determined thus gives a measure of density between the object.

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Faisal Ahmed

Hey! I'm Faisal Ahmed, the author of Tips Degree. I have a strong desire to educate people about education, science and technology, finance, and other trending topics through my content that's easy to understand. These contents created by me have helped many trainees around the world grow their careers. In my spare time, I love to swim and watch movies. I'm available on social media sites like Facebook, Pinterest, Medium, Flickr, etc.

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