Question

What's so we call the method of supplementation that illustrate it??

Answer 1

A gas is one of the three classical states of matter (the others being liquid and solid). ... A pure gas may be made up of individual atoms (e.g. a noble gas or atomic gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide).