Viscosity, resistance of a fluid (liquid or gas) to a change in shape, or movement of neighbouring portions relative to one another. Viscosity denotes opposition to flow. The reciprocal of the viscosity is called the fluidity, a measure of the ease of flow. Molasses, for example, has a greater viscosity than water. Under standard atmospheric conditions (25 °C and pressure of 1 bar), the dynamic viscosity of air is 18.5 μPas, roughly 50 times smaller than the viscosity of water at the same temperature. Except at very high pressure, the viscosity of air depends mostly on the temperature. The sea level standard value of air viscosity mu is mu = 1.73 x 10^-5 Newton-second/square meters = 3.62 x 10^-7 pound-second/square feet The density (specific volume), pressure, and temperature of a gas are related to each other through the equation of state. Viscosity of a fluid is strongly dependent on temperature and is a weak function of pressure. For example, when the pressure of air is increased from 1 atm to 50 atm, its viscosity increases only by about 10 percent allowing one to ignore its dependence on pressure. The absolute viscosity of many fluids relatively doesn't change with the pressure but very sensitive to temperature. For isothermal flow, the viscosity can be considered constant in many cases. The variations of air and water as a function of the temperature at atmospheric pressure are plotted in Figures 1.8 and 1.9.

1. Viscosity Of Air At 20 C
2. Viscosity Of Air At Different Temperatures
3. Viscosity Of Air Calculator
4. Viscosity Of Air At 300k
5. Viscosity Of Air At Stp
6. Viscosity Of Air 80f

Online calculator, figures and tables showing dynamic (absolute) and kinematic viscosity of air at temperatures ranging from -100 to 1600°C (-150 to 2900°F) at pressure ranging from 1 to 10 000 bara (14.5 - 145000 psia) - SI and Imperial Units

The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.

For further definitions, go to Absolute (dynamic) and kinematic viscosity. Absolute or dynamic viscosity is used to calculate Reynold's Number to determine if a fluid flow is laminar, transient or turbulent.

Viscosity Of Air At 20 C

Tabulated values and viscosity units conversion are given below the figures.

Online Air Viscosity Calculator

The calculator below can be used to calculate air dynamic or kinematic viscosity at given temperatures and atmospheric pressure.
The output dynamic viscosity is given as Pa*s, N*s/m², cP, mPa*s, lb_f*s/ft² and lb_m/(ft*h),
while the kinematic viscosity is given as cSt, m²/s, and ft²/s

Note! Temperature must be within the ranges -100 - 1600 °C, -150 - 2900 °F, 175 - 1900 K and 310-3400 °R to get valid values.

Viscosity Of Air At Different Temperatures

Viscosity Of Air Calculator

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Viscosity Of Air At 300k

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Viscosity Of Air At Stp

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Viscosity Of Air 80f

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