Question

Why the density of solid water is less than that of liquid water?

Answer 1

Answer:

Water's lower density in its solid form is due to the way hydrogen bonds are oriented as it freezes: the water molecules are pushed farther apart compared to liquid water. ... The (a) lattice structure of ice makes it lessdense than the freely flowing molecules ofliquid water, enabling it to (b) float on water.

Answer 2

Bcoz of the molecules in the solid are tightly packed... and are more rigid than those of molecules in liquid....

Hope it helps...