Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion

4. 

The dynamic viscosity of gases __________ with rise in temperature.

[A]. remain unaffected
[B]. increases
[C]. decreases

Answer: Option B

Explanation:

No answer description available for this question.

Waseem Iqbal said: (Apr 22, 2014)  
For liquid dynamic viscosity depends upon the cohesive forces which reduces with temperature so as the viscosity.

But for gases viscosity depends upon the diffusion of momentum which increases with temperature means the gas particle will diffuse their momentum quickly so viscosity increases.

Gaurav said: (Nov 6, 2014)  
Viscosity is the resistance to the flow so viscosity should decrease in gases while increasing the temperature.

Adjusted To See You said: (Dec 6, 2016)  
Absolutely you are right @Waseem.

Vicky said: (Jul 7, 2017)  
When increases temperature random motion of gas molecules are also go fastly and the reason of the viscosity of the gas is a random motion of particles (molecules) of gas.

So, the viscosity is increased.

Rajendra said: (Mar 9, 2020)  
In liquids,

If we are increasing the temperature, both kinematic and dynamic (absolute) viscosity DECREASES.

In gases,

If we are increasing the temperature, both kinematic and dynamic viscosity increases.

Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.