Question

The temperature of water at the surface of a deep lake is $2^{\circ }C$. The temperature of water expected at the bottom is _____.

Answer 1

When temperature of water is raised from 0°C to 4°C, it experiences a decrease in its volume thereby changing it density.

The graph shows the information of density of water at various temperatures. It is observed that, water has the highest density at 4°C.
In the given scenario, since the temperature at the surface is 2°C, implies that water under a deep lake would be 4°C because of its higher density.