Question

At what temperature is the density of water the maximum?

(a) 100^oC

(b) 0^oC

(c) 5^oC

(d) 0 K

I had been asked this question in class test.

Origin of the question is Newton’s Second Law topic in portion Fluid Dynamics of Fluid Mechanics

Answer 1

The correct choice is (c) 5^oC

The explanation: Heating a substance leads to faster movement of molecules due to which density decreases. Whereas, cooling a substance leads to a slower movement of molecules and occupies a smaller volume. Thus, increasing its density.