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Consequently, if a liquid has dynamic viscosity of n centiPoise, and its density is not too different from that of water, then its kinematic viscosity is around n centiStokes. For gas, the dynamic viscosity is usually in the range of 10 to 20 microPascal-seconds, or 0.01 to 0.02 centiPoise. The density is usually on the order of 0.5 to 5 kg/m^3.
The centipoise is convenient because the viscosity of water at 20 °C is about 1 cP, and one centipoise is equal to the SI millipascal second (mPa·s). The SI unit of kinematic viscosity is square meter per second (m 2 /s), whereas the CGS unit for kinematic viscosity is the stokes (St, or cm 2 ·s −1 = 0.0001 m 2 ·s −1 ), named after Sir ...
The values below 0 °C refer to supercooled water. Viscosity [11] 1.7921 mPa·s at 0 °C 0.5494 mPa·s at 50 °C 1.5188 mPa·s at 5 °C 0.5064 mPa·s at 55 °C 1.3077 mPa·s at 10 °C 0.4688 mPa·s at 60 °C 1.1404 mPa·s at 15 °C 0.4355 mPa·s at 65 °C 1.0050 mPa·s at 20 °C 0.4061 mPa·s at 70 °C 0.8937 mPa·s at 25 °C
Dimensionless numbers (or characteristic numbers) have an important role in analyzing the behavior of fluids and their flow as well as in other transport phenomena. [1] They include the Reynolds and the Mach numbers, which describe as ratios the relative magnitude of fluid and physical system characteristics, such as density, viscosity, speed of sound, and flow speed.
The poise is often used with the metric prefix centi-because the viscosity of water at 20 °C (standard conditions for temperature and pressure) is almost exactly 1 centipoise. [3] A centipoise is one hundredth of a poise, or one millipascal-second (mPa⋅s) in SI units (1 cP = 10 −3 Pa⋅s = 1 mPa⋅s). [4] The CGS symbol for the centipoise ...
Increasing temperature results in a decrease in viscosity because a larger temperature means particles have greater thermal energy and are more easily able to overcome the attractive forces binding them together. An everyday example of this viscosity decrease is cooking oil moving more fluidly in a hot frying pan than in a cold one.
In some companies, and Europe in particular, the volume collected is a litre, for which the water funnel time should be 28 seconds. Marsh himself collected 0.50 litre, for which the time was 18.5 seconds. [1] The Marsh funnel time is often referred to as the Marsh funnel viscosity, and represented by the abbreviation FV.
A brief review of the techniques available for measuring the volume viscosity of liquids can be found in Dukhin & Goetz [10] and Sharma (2019). [15] One such method is by using an acoustic rheometer. Below are values of the volume viscosity for several Newtonian liquids at 25 °C (reported in cP): [16]