The viscosity of a liquid can be defined as a measure of the resistance to deformation at a given speed.Ī viscometer is an equipment that helps measure the viscosity of a fluid. A viscometer comprises two reservoir bulbs and a capillary tube. U-tube viscometers are also known as glass capillary viscometers or Ostwald viscometers.
However, an appropriate measure of viscosity can be given with the help of a viscometer. The slower the ball will fall, the greater the viscosity it will have. The primary way of measuring viscosity is to drop a sphere, such as a ball, in a fluid and simultaneously time the fall of it. Measuring the viscosity of any matter helps in determining and designing the production and transportation procedure. For example, if the viscosity of toothpaste is not appropriate it will either be very difficult to pump out the toothpaste or a lot of toothpaste will be pumped out in one go. Viscosity of a given matter is calculated in order to measure the behaviour of the matter in the actual world.
Viscosity has a dimensional formula of . For instance, the viscosity of water at 27☌ (81☏) is 0.85 × 10 −3 and at 77☌ (171☏) it is 0.36 × 10 −3 pascal-second. However, the same for air at these temperatures are 1.85 × 10 −5 and 2.08 × 10 −5 pascal-second respectively.ĭifference in Viscosity between Water and Honey The SI unit of Viscosity if Poiseiulle (PI). Viscosity can be referred to as friction between the molecules of fluid. When the temperature is high the kinetic energy of a molecule also rises which results in the slipping of the intermolecular through one another between the layers. The Viscosity in a liquid decreases with the rise in temperature. The formula of Viscosity is: \(η = \frac\). The reciprocal of the viscosity is known as “fluidity”, which can be defined as a measure of the ease of flow. It typically occurs when a relative motion can be found between the layers of the fluid. Viscosity simply represents “the opposition to flow”. Viscosity measures the resistance in the flow of a liquid which arises due to internal frictions between layers of the fluids.
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