The viscosity of water decreases smoothly from the freezing point while the density remains essentially constant except for the small maximum in density near 4☌. In cgs units the unit is called the centistoke. The kinematic viscosity is the dynamic viscosity divided by the density of the fluid. The unit centiPoise = 0.001 Pa s and is is sometimes written mPa s. This is especially true if the resin has high viscosity and short pot life. 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☌. Air bubbles may then be reflected in a finished casting. The detailed calculations are included in Appendix A. The Poise is used in the table because of its more common usage. Airspeed at Cruise: 107 kts 180.6 ft/s Air Dynamic Viscosity at SL: 3.737 10-7 lbsec/ft2 Air Density at SL: 2.377 10-3 6slugs/ft3 Re/c: 1.14910 The summary of the individual drag contributions of the aircraft external components is given in Table 2 below. More commonly used is the dyne sec/cm 2 which is called Poise. Density Heat c p Conductivity Diffusivity Viscosity Viscosity Number T, 8C r, kg/m3 J/kgK k, W/mK a, m2/s m, kg/ms n, m2/s Pr 2 150 2.866 983 0.01171 4.8. ![]() Viscosity has the SI units Pascal seconds (Pa s) which is called the Poiseuille. Properties of air at 1 atm pressure Specific Thermal Thermal Dynamic Kinematic Prandtl Temp. panel of Figure 6.01 shows a typical vertical profile of temperature from the ground to 60 km. Viscosity of Liquids and Gases Viscosity of Liquids and Gases Liquids We will discuss the density of air in the stratosphere.
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