Question 1

Why does ice float on water?

Accepted Answer

Ice has a density of 0.917 g/cm³, less than water’s 1.0 g/cm³. This is unusual — most solids are denser than their liquid form.

Question 2

What is the densest everyday material?

Accepted Answer

Among common metals, gold (19.3 g/cm³) and lead (11.3 g/cm³) are very dense. The densest element is osmium at 22.6 g/cm³.

Density

化学