![]() ![]() V1 = Viscosity of unknown liquid (Whoes to be calculated) This method is frequently used in quality control, and in production laboratories.)ĭetermination of viscosity of liquid using ostwald viscometer Rotational Viscometer (The rotational viscometer measures the torque required to turn an object in a fluid as a function of that fluid’s viscosity. This technique is often used in-process to give continuous readings in a product stream, batch vessel, or in other process applications.) Vibrational Viscometer (Vibrational Viscometers measure the damping of an oscillating electromechanical resonator immersed in a fluid. The Zahn cup is often used in the paint industry.)įalling Sphere Viscometer (Falling Sphere Viscometer) ![]() The time it takes to empty the cup through the hole is correlated to viscosity. Zahn Cup (which is a small container with a handle, and a small hole in the bottom. Specific gravity = Density of substance/density of water = weight of substance/weight of waterĬapillary Viscometer (The earliest methods for measuring viscosity were based on using capillary tubes and measuring the time it took for a volume of liquid to pass through the length of the tube.- Ostwald or Ubbelohde viscometers) ![]() Since (at standard temperature and pressure) water has a density of 1 gram/cm3,Īnd since all of the units cancel, specific gravity is usually very close to the same value as density (but without any units). Specific gravity is the density of a substance divided by the density of water. Hydrometer (show relative density(specific gravity) on hydrometer graduated scale).ĭensity of substance = reading at hydrometer x density of water at that temp. ![]()
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