What Are The Applications Of Archimedes Principle?

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Application of Archimedes' Principle
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 (and vice versa). 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 weight is more than the buoyant force. It becomes stationary when the weight = 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.

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