Question

The viscosity of liquid ____________as temperature increases.

(a) increases

(b) decreases

(c) remains same

(d) fluctuation

The question was asked in class test.

My doubt stems from Fluid Flow Theory in portion Fluid Flow Theory & Applications of Food Processing Unit Operations

Answer 1

Correct answer is (b) decreases

Easy explanation: The viscosity of liquid decreases as temperature increases. As temperature rises, there is an increase in the average speed of the molecules in the liquid and the contact time in between the molecules is also decreased.