![]() ![]() Just as an example, to calculate viscosity index we can use online viscosity index calculator or excel tools. Common methods for viscosity index calculations are ASTM D2270 and ISO 2909. Q: How to calculate viscosity index?Ī: The viscosity index of a fluid (usually oil) is calculated from its viscosity at 40 and 100☌. Therefore higher viscosity index or higher VI means fluid is more stable and less changes in viscosity over a wide temperature ranges. Viscosity index indicates the change in fluid viscosity in dependence of temperature. Q: What is viscosity index?Ī: Viscosity index of a fluid is a calculated number according to ASTM D2270 or ISO 2909. ![]() For example the viscosity of honey is higher than the water. High viscosity fluid has more resistance to flow than a low viscosity fluid. If viscosity of fluid is high, most likely it is difficult to pour. Hence high viscosity fluids flow less easily or slower. Low viscosity fluids (low resistance to move) flow or pour more easily and faster. Therefore oil/fluids are usually measured at the same temperature to calculate viscosity. Lubricants Viscosity and Viscosity index Q: What is Viscosity?Ī: Viscosity is a fluid’s resistance to flow at given temperature. Press Calculate button to calculate kinematic viscosity (KV) As before, use Clear button to reset and calculate a new viscosity. Calculate Viscosity use calculator 3 to calculate viscosity (KV) Enter known viscosity index (VI) and kinematic viscosity (KV) in table 3. Click Calculate to get KV As previously stated, use Clear button to start a new calculation. Enter kinematic viscosity (KV) in the second row. Similarly with known viscosity index (VI) and viscosity It is possible to calculate viscosity For example enter viscosity index (VI) in the first row of second table. Calculate Viscosity possibility is to calculate kinematic viscosity from viscosity index. Finally, press Clear button to start again. Click Calculate button to get viscosity index (VI). In the first row table 1, Enter kinematic viscosity (KV) at 40☌, In the same way enter kinematic viscosity in the second row. The output dynamic viscosity is given as Pas, Ns/m 2, cP, mPas, lb f s/ft 2 and lb m / (fth), while the kinematic viscosity is given as cSt, m 2 /s, and ft 2 /s. To calculate viscosity index we need viscosity of an oil both at 40☌ and 100☌. The calculator below can be used to calculate air dynamic or kinematic viscosity at given temperatures and atmospheric pressure. The unit for density is g/mL.Standard practice for viscosity index (VI) calculation as per ASTM D2270 and ISO 2909. The density of both the sphere and the liquid are needed to perform the viscosity calculation. ![]() ![]() Some common liquids you could try including water, honey, corn syrup, cooking oil, and milk.Ĭalculate the density of your chosen sphere. Try testing many different liquids with different flow rates to see how their viscosities differ. The liquid must be clear enough to see the marble as it’s dropped through the liquid.You can use a watch instead of a stopwatch, but your measurements will be more accurate with a stopwatch.A graduated cylinder is a plastic container that has graded markings on the side that allow you to measure volume.Make sure its diameter is no greater than half the diameter of the graduate cylinder so it can easily be dropped into the cylinder. The sphere can be a small marble or steel ball.X Research source This experiment has many steps, but when followed correctly, they will allow you to calculate the viscosity of any liquid. To calculate viscosity of a liquid, you will need a sphere, a graduated cylinder, a ruler, a stopwatch, the liquid in question, a scale, and a calculator. Gather the necessary materials for the experiment. ![]()
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