Gases pl. : of Gas

Example:
What is true about Gases when the temperature increases?

Taxonomy
gas, particles, gas particles, pressure, molecules, density, container, collisions, assumptions, perfect gas, atoms, equations, gas molecules, Real gas, ideal gas, specific volume, intermolecular forces, models.

Defination from the web:
gases much like the air that we breathe. ... As most gases are difficult to observe directly, we uniquely describe them through the use of four physical properties or macroscopic ...