Archimedes principle: The buoyant force exerted on a body immersed in a . The reasoning behind the Archimedes principle is that the buoyancy force on an. Archimedes’ principle, physical law of buoyancy, discovered by the ancient Greek mathematician and inventor Archimedes, stating that any. Archimedes’ principle states that when a body is partially or fully dipped into a fluid at rest, the fluid exerts an upward force of buoyancy equal to the weight of.

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Archimsdes was one of the greatest mathematicians of all times. He was a Greek mathematician who was also a physicist, scientist and a great inventor.

Born in B. His most famous inventions include the screw propeller and the principle of flotation, among others. His mathematical works include inventing infinitesimals and formulas on measurement of a circle, parabolas, spheres, cylinders and cones.

However, the principle of flotation remains one of his most popular inventions. Principle of Flotation by Archimedes Ever wondered how huge ships manage to stay afloat in water, while a small iron atchimedes sinks?

Puzzling as it may appear, you can easily explain this, and many other similar phenomena, with the help of the Archimedes’ Principle of Princlple. So, what is the Archimedes’ Principle all about?

Definition The Archimedes’ principle states that any object, wholly or partially immersed in a fluid, experiences an upward force equal to the weight of the fluid displaced by it. Here the term ‘fluid’ refers to all liquids and gases.

For an object that is completely submerged in a fluid, the weight of the fluid displaced by it, is less than its own weight. On the other hand, for an object that floats on the surface of the flatation, the weight of the fluid displaced by it, is equal to the weight of the object.

Archimedes’ principle

Now, the upward force experienced by the body is termed as the buoyant force. This can be illustrated by the following equations. The density of the body is less archjmedes the density of the fluid. The volume of the fluid displaced floatqtion the immersed part of the body is such that its weight is equal to the weight of the body. The following two examples will help you understand this.

Firstly, consider two cubes of the same dimensions, one made of cork and the other made of solid iron. If you place them on the surface of water, what will happen? Well, the iron cube would sink, while the cube made of cork would easily float on water. Now, take the example of a nail and a ship, both made of iron. While the nail sinks, the ship floats on water carrying several passengers and cargo. In the first example, the cork cube sinks while the iron cube does not, because the density of iron is higher but the density of cork is lower than that of water.


It is the same reason we find it easier to swim in sea water than in river water, as the density of sea water is high due to the dissolved salts present in it. Now, let’s consider the example of the nail and the ship. When you place a nail in water, the weight of the water displaced by the nail is less than the weight of the nail itself. In other words, the floatatuon force experienced by the nail which is equal to the weight of the water displaced by it is less than its weight, and the nail sinks in water.

However, when you observe a huge ship that floats on water, you’ll see that f,oatation ship is hollow, which means it is filled with air. This makes the average density of the ship lower than that of water. Thus, with only a small part of it submerged in water, the weight cloatation the water displaced by the ship, becomes equal to the buoyant force, and the oof floats on water.

Archimedes’ Principle

From this we can conclude that, for a body to float in water or any other fluid, the weight of the fluid displaced by the body should be equal to the weight of the body. In other words, more the weight of a body, more the volume of fluid it needs to displace, in order to principlw in the fluid.

Suppose an iron ball weighs 20 kg. When a string is tied to the ball and it is submerged in water, the weight of water displaced by the ball is, say, 7 kg.

Therefore, the ball would experience an upward force equal to 7 kg.

Archimedes’ Principle of Flotation

Thus, it can be concluded that the weight of the ball decreases when it is immersed in water. This reduced weight of the ball is termed as the apparent weight.


Hence, the Archimedes’ principle can be restated as follows. However, the story behind the discovery of the principle of flotation, is an interesting one.

Briefly put, it goes this way. The king of the land had got a golden crown made, to be offered to the deity of a temple. However, he doubted the honesty of the goldsmith, due to which he wanted to make sure that it was only pure gold that was used to make the crown.

The great scientist that Archimedes was, he was called by the king and was asked to check if the crown was indeed made from pure gold, without causing any damage to it. Now, this was certainly not an easy job and it put him in a fix. However, one day as he stepped into the bathtub, he noticed the water spilling over.

Archimedes’ principle | Description & Facts |

At that very moment, an idea occurred to him. He realized that by measuring the volume of water displaced by the crown, he could easily calculate its density. All he needed to do was divide the mass of the crown by the volume of displaced water. So much was he excited by this discovery that he took to the streets shouting, ” Eureka, eureka! This was a brief introduction to the concept behind the Principle of Flotation by Archimedes.

This principle has a range of applications, including the hydrometer, hot air balloons, submarines and water transports such as ships and boats. So, the next time you have a fun time on a cruise, you know whom to thank for! Working Principle and Its Advantages and Disadvantages. Working, Principle, and Applications. How Does Light Travel. Does the Fourth Dimension of Time Exist? How Does a Diode Work?

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