Question

2) Briefly describe how viscosity changes as a function of temperature for both a liquid and gas. Provide an explanation for each. a maid. danimacar os commenti ya Ucrans

Answer 1

Hi,

Viscosity- It is the measure of a fluid's (liquid & gases) resistance to flow.

For,
Liquids - The viscosity of a liquid decreases with increase in temperature.
The reason being as the temperature of liquid increases, the average speed of the molecules in a liquid increases which results in a reduction   between the the average intermolecular forces . Viscosity varies in a nonlinear manner with temperature and changes abruptly when the liquid changes phase.

Gases- The viscosity of a gases increases with increase in temperature

The reason being as we know from the kinetic theory of gases, that in gases an increase in temperature will result in increase in kinetic energy which will increase the frequency of collisions between the molecules.This increases the gas viscosity as it is a result of the transfer of momentum between stationary and moving molecules.

Thank you

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