![]() Thus, dynamic viscosity is a measure of force, while kinematic viscosity is a measure of velocity. Kinematic viscosity incorporates fluid density as part of its measurement. What is difference between kinematic and dynamic viscosity? … Water at 20 C has a kinematic viscosity of about 1 cSt. Other units are: 1 St (Stoke) = 1 cm 2/s = 10 4 m 2/s. The SI unit of the kinematic viscosity is m 2/s. The kinematic viscosity is the ratio between the dynamic viscosity and the density of a fluid. The kinematic viscosity formula is expressed as, = / What is kinematic viscosity unit? It is the ratio of the area of time henceforth it is m22/s or ft22/s. It is the ratio of the dynamic viscosity to its density, a force independent quantity. The units of kinematic viscosity are established on time and area. Kinematic viscosity can be computed by dividing the absolute viscosity of a fluid with the fluid mass density. Kinematic viscosity might seem like a heady concept, but with the right tools, it doesn't need to be intimidating.Ĭonverting between units can be difficult, but online calculators (like this one) can help relieve much of the headache.How do you calculate liquid kinematic viscosity? In addition to m 2/s, you may find any number of metric subdivisions, such as square centimeters (cm 2/s), square millimeters (mm 2/s), or other, smaller units. Whkle Stokes and centiStokes are the primary units used in kinematic viscosity, but they are hardly the only units you'll come across. ![]() The kinematic viscosity of water at 20 degrees Celsius (about room temperature) is exactly 1 cSt. These formulas might seem arbitrary, but there is an important real-world reason for it. You can also calculate cSt with the following formula: 1 centiStoke (cS) = 10 -6 m 2/s = 1 mm 2/s To make it more practical, the Stoke is often divided by 100 to make the centiStoke (cSt). Think of it like trying to measure your height in miles. The Stoke is a rather large unit, which makes it difficult to use for subtle shifts in kinematic viscosity. The formula for determining a Stoke is as follows: 1 Stoke (St) = 10 -4 m 2/s = 1 cm 2/s Nonetheless, we'll review a few common conversion factors below. The easiest method to get accurate results is by using a conversion calculator. Kinematic viscosity is determined by measuring how long it takes for the container to empty.Ĭonverting kinematic viscocity requires knowledge of certain ratios. A Zahn cup is a container with a precise hole in the bottom. This is a device that measures how long it takes a liquid of a fixed volume to flow through a small tube.Īn even simpler tool is a Zahn cup. Kinematic viscosity is often measured using a capillary tube viscometer. Gasesįor liquids, kinematic viscosity will decrease when temperatures increase.įor gasses, it will increase when temperatures increase. ![]() While kinematic viscosity does not change with pressure, it does change with temperatures.Īs temperatures decrease or increase, the molecules move more slowly or more quickly. Whereas dynamic viscosity is usually used to talk about how difficult it is to pour a fluid when a force acts upon it, kinematic viscosity refers to the fluid's resistance when no force but gravity is acting upon it. Kinematic viscosity is the ratio of the fluid's dynamic viscosity to the fluid's density. To learn more about dynamic viscosity, visit our dynamic viscocity page. This stickiness is what keeps a thick liquid from pouring freely. This is the internal resistance of a fluid to itself.Īs a liquid is moved, the different layers of the liquid stick to one another. Most often, when the average person talks about viscosity, they are referring to dynamic viscosity. Let's take a look at their similarities and differences. Your eighth-grade science teacher may not have taught you that there are a few different types of viscosity: dynamic and kinematic. Viscosity refers to the thickness of a liquid.
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