First slide

Thermal expansion

Question

In cold countries, water does not freeze at the bottom of a lake in winter, on account of

Easy

A

anomalous expansion of water between 4°C and 0°C
B

ice being lighter than water
C

ice being poor conductor of heat
D

all the above three factors

Solution

On heating from 0°C, volume of water decreases and becomes minimum at 4°C. So at 4°C, density of water at 4°C, goes below the water at 0°C.
Ice is lighter than water and it floats on the surface of lake.
So option (4) is right.

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