What are the Physical characteristics as a gas?

Gases have several distinct physical characteristics: they have no definite shape or volume, expanding to fill their container completely. They are compressible, meaning their density can change significantly with pressure changes. Additionally, gas particles are far apart and move freely and rapidly, leading to low density and high kinetic energy compared to solids and liquids. Lastly, gases can diffuse and mix uniformly with other gases due to their high molecular mobility.