Matter {gas phase} can have low density, flow, be compressible, have no local or global order, and expand to fill volume.
energy
Gases have high kinetic energy. Molecules have speed 500 meters per second. Electric forces between molecules have little effect.
distances
Molecules are 20 nanometers apart. Gases have distances between molecules that are five to ten times more than distances in solids and liquids. Gases are like spaces of vacancies with some positions filled.
size
Gas-molecule diameter is 0.5 nanometers.
relations
If gas volume increases while temperature stays the same, pressure decreases, and entropy and potential energy increase. If gas temperature increases while pressure stays the same, volume increases, and entropy and potential energy increase.
Temperature and pressure depend on kinetic energy, and volume and entropy depend on potential energy. If total energy is constant, P/V = S/T, where P is pressure change, V is volume change, S is entropy change, and T is temperature change. Potential energy increases when entropy increases, and entropy increases when potential energy increases.
Physical Sciences>Chemistry>Inorganic>Phase>Phases
5-Chemistry-Inorganic-Phase-Phases
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224