Question

What is the effect of temperature on viscosity of a liquid and why?

Answer 1

With an increase in temperature, there is typically an increase in the molecular interchange as molecules move faster in higher temperatures.
In a liquid there will be molecular interchange similar to those developed in a gas, but there are additional substantial attractive, cohesive forces between the molecules of a liquid (which are much closer together than those of a gas). Both cohesion and molecular interchange contribute to liquid viscosity.

Answer 2

The viscosity of a liquid decreases with an increase in temperature.

• The viscosity of a liquid is defined as the resistance toward the flow of liquid.
• As the temperature of liquid increases the intermolecular force of attraction between the particles of liquid decreases and resistance towards the flow of liquid decreases and the viscosity decrease.

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