The reading of the scale will increase by the mass of the displaced water (assuming that the scale measures mass), from which the volume of the object can be determined. The object is then hung from a string above the water, and slowly lowered into it until it is completely submerged, but without touching the bottom of the container (if the object is less dense than water, it can be pushed under water). A container partially filled with water is placed on a scale and the reading of the scale is recorded. The problem, however, can be resolved by taking advantage of Archimedes’ principle. In addition, this method certainly cannot be used to measure the volume of a large object such as a boulder. This method, however, requires that the diameter of the cylinder be at least as large as the diameter of the object, which reduces the accuracy of the measurement. The increase in the level of water inside the cylinder is simply equal to the volume of the object. The object is then slowly lowered into the cylinder until it becomes completely submerged. The simplest method is to use a graduated cylinder filled with water to a certain level. One of the applications of Archimedes’ principle is in measurement of density of an irregularly shaped object. The principle of isostasy, for example, which states that Earth’s crust is in floating equilibrium with the denser mantle below, is simply based on Archimedes’ principle. This principle, which is perhaps the most fundamental law in hydrostatics, explains many natural phenomena from both qualitative and quantitative points of view. Basically the principle states an object immersed in a fluid is buoyed up by a force equal to the weight of the fluid that it displaces. Īrchimedes’ principle is one of the most essential laws of physics and fluid mechanics. More specifically, in the last two decade or so, more than a dozen papers have been published in different journals, ranging from pedagogical points of view to scrutinizing the original statements made by Archimedes. Although the law of buoyancy was discovered by Archimedes over 2200 years ago, even today from time to time new articles appear in the literature inspecting its various aspects.
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