Do Gasses Have Viscosity?

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SUMMARY

Gases do possess viscosity, similar to liquids, but their behavior differs with temperature changes. For gases, such as air, viscosity increases with temperature, contrary to liquids where viscosity decreases with rising temperature. Sutherland's formula is a key tool for calculating the viscosity of gases based on temperature. Understanding these principles is essential for applications involving fluid dynamics and thermodynamics.

PREREQUISITES
  • Basic understanding of fluid dynamics
  • Familiarity with thermodynamic principles
  • Knowledge of Sutherland's formula for viscosity calculations
  • Awareness of the properties of gases and liquids
NEXT STEPS
  • Research Sutherland's formula for calculating gas viscosity
  • Explore the relationship between temperature and viscosity in gases
  • Study the differences in viscosity behavior between liquids and gases
  • Investigate applications of gas viscosity in engineering and physics
USEFUL FOR

Students and professionals in fluid dynamics, mechanical engineers, and anyone interested in the thermodynamic properties of gases and their applications in various fields.

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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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