Question

In nature, there exists an inverse relationship between density and temperature for most substances. In other words, for most substances, when the temperature increases the density decreases, and vice versa. This is NOT true for water. In one concise paragraph, please explain why.

Answer 1

When water molecule is present at low temperatures(in the form of ice) it usually attains a honeycomb like structure where each water molecule is sorrunded by only three molecules of water due to formation of hydrogen bonds.hence there will be large empty holes present in structure of water at low temperatures hence less density.

But when water is heated (converted to liquid water) maximum number of hydrogen bonds are broken and the empty spaces are filled by more water molecules hen ce now at high temperatures water attains cagelike structure there by increasing the density.