Liquid-helium Sentence Examples

Density is the measurement of how tightly or loosely a given substance is packed into a given volume. Air, for example, is low density, much lower than human tissue, which is why we can pass through it. The same does not apply to granite. Don’t try to walk through granite. It’s bad for you.

There are three states of matter: solids, liquids and gases. In many cases, the same element can exist in all three states.