12/15/2023 0 Comments Viscosity units in english![]() ![]() Work done in increasing the size of a soap bubble from a radius of 3cm to 5cm is nearly…?.A closed compartment containing gas is moving with some acceleration in horizontal direction…?.If the potential energy of a body on a planet is numerically U and the escape velocity…?.A rain drop of radius 0.3mm has a terminal velocity of 1m/s and the viscosity of…?.At what speed, the velocity head of water is equal to pressure head of 40cm of Hg…?.Which one of the following equation is Torricelli law?.A water drop is divided into 8 equal droplets.When 11.2cm of water is poured into one of the arms…? A uniform capillary tube of inner radius r is dipped vertically into a beaker filled with water…?.A square wire frame of size L is dipped in a liquid. ![]() A cylindrical capillary tube of 0.2mm radius is made by joining two capillaries…?.A solid sphere falls with a terminal velocity of 20m/s in air.If the work done in blowing a bubble of volume V is W, then the work done in…?.A sphere of radius R is gently dropped into liquid of viscosity η in a vertical uniform tube…?.Bernoulli’s principle is based on the law of conservation of…?.If the excess pressure inside a soap bubble is balanced by oil column of height…?.Important Topics From Chapter 10: Mechanical Proeprties of Fluids The unit of viscosity in SI units is Kg/ms and in CGS it is dyne s cm -2.The coefficient of viscosity is considered as the measure of viscosity.Viscosity is the fluid resistance against its flow and it comes into action due to the relative motion of the internal layers of the fluid.The viscosity of liquids decreases with the increase in temperature, whereas in gases viscosity increases with an increase in temperature. ![]() For example, Blood is more viscous compared to water. In general, thick liquids are more viscous than thin liquids.The above equation is known as Newton's formula for viscous force. Where \(\eta\) is the coefficient of viscosity, the negative sign implies that the viscous force is acting in the opposite direction of the fluid flow. The velocity gradient between the layers in contact is hence, The area of contact between the layers A is directly proportinal to the dragging force, Schematic for Coefficient of Viscosity DerivationĬonsider the dragging force F tangentially between the layers of the fluid, and it is proportional to, Viscosity is symbolized by \(\eta\), “eta”, and the use of the Greek letter mu (μ) is also quite common.The backward dragging frictional force is called Viscous drag or Viscous Force, which acts tangentially on the layers of the fluid.Viscosity is a peculiar property exhibited by the fluids due to which an internal frictional force comes into action when the fluid starts moving, and this very friction opposes the relative motion between the layers of the fluid.Viscosity is referred to as the ratio of the force required to make adjacent layers of the liquid move over each other. Furthermore, other abbreviations are sometimes used such as SUV (Saybolt universal viscosity) or SSU (Saybolt seconds universal).Earlier, the kinematic viscosity was measured by using Saybolt viscometer where the units were expressed in Saybolt universal seconds (SUS).Some non-standard units of viscosity are the Reyn which is a British unit of dynamic viscosity. Sometimes the unit centistokes (cSt) is also used. ![]()
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