Do Gasses Have Viscosity?

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Gases do possess viscosity, similar to liquids, but their behavior differs with temperature changes. For gases, viscosity increases with temperature, contrary to liquids where viscosity decreases with rising temperatures. The discussion references Sutherland's formula for calculating gas viscosity based on temperature. Additionally, viscosity is influenced by pressure, indicating that constant pressure conditions are important for accurate measurements. Understanding these principles is essential for applications involving gas flow and dynamics.
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Fluids have viscosity, but do gasses have it? And in that case, what is the viscosity for normal air (I know air isn't one gas)?
 
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Like liquid, gas has viscosity of course. But only one thing they are different is for liquid, the higher the temperature, the lower the viscosity and for gas, it's opposite.
 
pixel01 said:
Like liquid, gas has viscosity of course. But only one thing they are different is for liquid, the higher the temperature, the lower the viscosity and for gas, it's opposite.

I don't doubt that you are correct, but could you or someone explain this to me?
 
Archosaur said:
I don't doubt that you are correct, but could you or someone explain this to me?
It is correct. It has to do with momentum transfer between molecules in the gas. Look up Sutherland's formula to see how to calculate a gases viscosity based on temperature.
 
pixel01 said:
Like liquid, gas has viscosity of course. But only one thing they are different is for liquid, the higher the temperature, the lower the viscosity and for gas, it's opposite.

I guess that is under a constant pressure, otherwise the viscosity is dependent on the pressure, isn't it?
 
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