![]() ![]() ![]() 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. Note: For ideal gases, the properties cp, k, m, and Pr are independent of pressure. Hydrogen is not toxic but is a simple asphyxiate by the displacement of oxygen in the air. It is flammable over a wide range of vapor/air concentrations. Once ignited it burns with a pale blue, almost invisible flame. Prandtl Number of Air Prandtl Number of Dry air at 1 atm pressure: Temp, C Temp, F Temp, K Prandtl Hydrogen, H2, is a colorless, odorless gas. The values of μ, cp and k are only very weak functions of pressure so the Prandtl number presumed independent of pressure. The values of μ, cp and k are acknowledged to change with temperature consequently the Prandtl number will change with temperature. ![]() K is thermal conductivity, (SI units: W/m Α is the thermal diffusivity, α = k / (ρ cp). Μ is dynamic viscosity, (SI units: Pa s = N s/m2). ![]()
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