Question

Relative change in viscosity with temperature is called ?

Answer 1

Answer:

• In liquids it usually decreases with increasing temperature, whereas, in most gases, viscosity increases with increasing temperature. ...

Answer 2

Relative change in viscosity with temperature is called Viscosity index

Explanation:

• The viscosity index (VI) is indeed an arbitrary, dimensionless quantity measurement of a fluid's viscosity variation as temperature changes. This is primarily used to describe the viscosity-temperature behaviour of lubricating oils.

• The fluid viscosity is a measurement of its apparent viscosity. This is something you're already aware of, but under a different term - stickiness. The much more viscous a fluid is, the denser it is.

• For example, honey vs water. Honey inhibits movement more than most other typical fluids, such as water or juice, and is 'stickier,' therefore it's a much more viscous fluid.