If you pour a glass full of water on your head, it will run through your hair and flow over your face quickly. This difference is due to a fluid property called Viscosity.Īlso Read: Viscosity in Detail What is Viscosity? Kinematic viscosity units full#īut if you pour a glass full of Oil on your head, it would take more time to flow through the hair and reach your face. Viscosity is the tendency of a fluid to resist any change in its form or movement. It’s a measurement of the inner forces of a fluid. The internal forces or friction of fluid comes into play while one layer of fluid is subjected to move over every other layer. Greater is the friction, greater is the quantity of force required to move the layers this is known as shear. Shearing happens while a fluid moves or is transferred, like pouring, spraying, spreading, blending, and so on. This is the reason why fluids with excessive viscosity need greater pressure to move than the ones with low viscosity. The measurement of the resistance offered by the fluid to deformation at a given is known as the viscosity of the fluid.Įxample: The Viscosity in honey is higher than in water. So, the other units of Viscosity are N s m -2 or Pascal seconds (Ps) Need to measure Viscosity So, the unit of viscosity is dynes sec cm -2. It is very important for manufacturers to know about the properties of a material. So, to understand the nature of the given material, they gather all the material data, including its viscosity. The measurement of viscosity is very important for the manufacturing of a product.įor Instance, if the viscosity of toothpaste is incorrect. Either it would be difficult to remove the paste from the tube or the whole paste will pump out in a single pressure. Moreover, the production and logistics processes are designed only when the viscosity of a material is precisely measured. There are two different ways to measure the viscosity of a fluid and they are: Viscosity is the measurement of the friction of the fluids. Under the weight of gravity, the resistive flow of a fluid is measured.The most common method used to measure kinematic viscosity is using a capillary tube in which the fluid is allowed to flow through it and the time taken is measured.Mostly Newtonian liquids use kinematic viscosity measurement.Stokes is the unit of Kinematic viscosity.An external force is applied to measure the resistance flow of the liquid.The most popular instrument used to measure dynamic viscosity is Rotational Viscometers.To know the internal resistance of a fluid, dynamic viscosity is measured.Įvery fluid/liquid has a different viscosity level.Pascal seconds (Pa s) is used to measure Viscosity. The importance of viscosity can be understood from the given points: Below mentioned are some of the different fluids and their viscosities. The ink used in the pen is made of high viscosity fluid.For any painting purpose, fluids with high viscosity are used.Blood circulation through arteries and veins depends upon the viscosity of fluids.Viscosity is determined even in food batters used to prepare dosa, idli, chapatis, etc.
Fluids with high viscosity are used to create medicines like syrups.Fluids with high viscosity are used to create glue/gum.The measurement of the resistance offered by the fluid to deformation at a given is known as the viscosity of the fluid.
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