In cgs units the unit is called the centistoke. Compare this value with the corresponding ratio of kinematic viscosities.Assume the air is at standard atmospheric pressure.Hint: Use the tables in the tex. The kinematic viscosity is the dynamic viscosity divided by the density of the fluid. Determine the ratio of the dynamic viscosity of water to air at a temperature of 60 degrees C. of its density, specific volume, and specific gravity relative to water at 60F Use Appendix A. The unit centiPoise = 0.001 Pa s and is is sometimes written mPa s. Density and specific weight of a fluid are related as. These viscosities are at 20☌ except for the blood and blood plasma which are at body temperature, 37☌, and for steam which is at 100☌. This is especially true if the resin has high viscosity and short pot life. Take the density and dynamic viscosity of air at 1 atm and 60F as 0.07633 lbmft3, 0.04365 lbm/ft-h, and V-o5718 ft2/hrs 1.588 x 10-4 ft2/s. The Poise is used in the table because of its more common usage. Air bubbles may then be reflected in a finished casting. More commonly used is the dyne sec/cm 2 which is called Poise. Viscosity has the SI units Pascal seconds (Pa s) which is called the Poiseuille. Viscosity of Liquids and Gases Viscosity of Liquids and Gases Liquids
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