Question

Explain why in winter,water tank starts freezing from the surface and not from the bottom

Answer 1

When the temperature of water at thesurface falls, water contracts, so its density increases and therefore it sinks to the bottom. ... In short this happens due to anomalous expansion of water.

Answer 2

When the temperature of water at thesurface falls, water contracts, so its density increases and therefore it sinks to the bottom. ... In short this happens due to anomalous expansion of water.