Solids and liquids as compared to gases have much lower compressibility.įluids offer very little resistance to shear stress. Fixed volume in physics means the volume under atmospheric pressure. The volume of all the three forms that Is solid liquid or gas is dependent on the stress or pressure acting upon it. The topics related to Archimedes principle have taught us that volume of solids can be changed by stress. All the processes that are responsible for the growth of living beings are mediated by fluids. Every mammal’s body on the earth constitutes mostly water. The study of fluid is extremely important as fluids cover a significant part of the earth and they are used in our day to day lives as an essential component. The chapter mechanical properties of fluids mainly deal with the common physical properties of liquids and gases. Archimedes’s principle is extremely important in the study of buoyancy in physics, this principle is explained very briefly in Chapter 10 called mechanical properties of fluids of Class 11 in the NCERT book, this chapter is prescribed by the Central Board of secondary education as it includes various important topics whose understanding is extremely important for higher studies. From large ships to small boats, aircraft, submarines all of these operate according to the principle of buoyancy. This relationship was invented by Archimedes. The decreased weight is equal to the weight of the fluid, displaced by the object. Due to the buoyant force, there is an apparent decrease in the weight of the object. This upward force is called the buoyant force. When an object is partially or completely submerged in a fluid, it exerts an upward force on the object. This pressure is the result of the weight of the fluid. Any fluid applies equal pressure in every direction.
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