Therefore, a material volume immersed in a fluid does not host two mechanical actions - the 'weight' of the volume itself, directed downwards, and the 'Archimedes' force', directed upwards вЂ“ but a single mechanical action. When a volume of matter вЂ“ a body - is immersed in a fluid, it 'loses' its own weight, i.e., it is no longer home to the downward-directed mechanical action of which the volume is home when it is immersed in a vacuum. A different physical interpretation is the correct interpretation, which is equivalent to the current one from the quantitative viewpoint, but significantly different from the physical viewpoint. It is based on a assumption which is false, because it leads to contradict observed facts. To dive into the water, fishes release the air from the swimbladder, hence their volume decreases, and buoyant force acting upon them also reduces.The current physical interpretation of the phenomenon of floating of a body on the surface of a liquid - the so-called вЂ™ArchimedesвЂ™ PrincipleвЂ™ - is not correct. Fishes filled their swim bladder with air to rise to the water surface as it increases their volume, and more water is replaced by them, hence buoyant force exerted on them also increases. Most of the fishes have a swim bladder, which helps them control the buoyant force acting on them. To measure the density of the substance, it is suspended to the spring balance, and when it is immersed in a liquid whose density is known to us, the apparent loss in the mass of the sample substance is noted down, and by using the ArchimedesвЂ™ principle, the density of the substance is then calculated.ДЄrchimedesвЂ™ principle also comes into play to make a fish float in the water. The density of the solids can be measured using this principle. Milk is kept undisturbed for a while until the cream deposits on it, and then the lactometer is placed in this milk sample, if the lactometer floats it means that milk is pure, but if the lactometer sinks, it means milk is adulterated or impure.ДЄrchimedesвЂ™ principle finds its applications in geology too. Lactometers measure the specific gravity or density of the milk, which helps in finding the contents present in milk and determine its purity. Like hydrometer, it also works according to ArchimedesвЂ™ principle. Lactometer is an instrument that is used to check the purity of the milk. The density between the air and the balloon is controlled by varying the amount of hot air in the balloon. When the weight of the surrounding air and hot air balloon is equal, it becomes stationary. The balloon rises in the air when the weight of the air surrounding the balloon is greater than its own weight, whereas if the weight of the balloon is greater, it will start descending. As saltwater has a higher density than freshwater, the buoyant force acting on the body in saltwater will also be higher as compared to freshwater, which is why it is easier for the swimmers to swim in the saltwater.ДЄrchimedesвЂ™ principle is also applied to the working of hot air balloons.

The Buoyant force exerted on the body by the fluid is mathematically expressed as,

The Buoyant force acts at the center of gravity point of the displaced fluid, this point is known as the center of Buoyancy. Archimedes Principle is named after its discoverer, the Greek mathematician, and physicist вЂArchimedes.вЂ™ It is based on the principle of buoyancy, which states that if a body is partially or fully submerged in the fluids (gases or liquids), then the fluid exerts an upward force called the buoyant force on the body whose magnitude is equal to the fluid weight displaced by the body.

Definition archimedes principle