As the temperature increases, the coefficient of viscosity of gases:

Question

Question

This question was previously asked in

HTET TGT Science 2017 Official Paper

Answer 1

Explanation:

The ratio of the shearing stress to the velocity gradient is a measure of the viscosity of the fluid and is called the coefficient of viscosity.

η = Fx/Av.

The cgs unit for measuring the coefficient of viscosity is the poise.
Experiments have shown that the coefficient of viscosity of liquids decreases with increasing temperature, while the coefficient of viscosity of gases increases with increasing temperature.
In liquids an increase in temperature is associated with the weakening of bonds between molecules; since these bonds contribute to viscosity, the coefficient is decreased.
On the other hand, intermolecular forces in gases are not as important a factor in viscosity as collisions between the molecules, and an increase in temperature increases the number of collisions, thus increasing the coefficient of viscosity.

So, As the temperature increases, the coefficient of viscosity of gases increase.