Gas-Phase
The term "gas-phase" refers to the state of matter where substances exist as gases. In this phase, molecules are widely spaced and move freely, allowing them to fill the entire volume of their container. This behavior is due to the high kinetic energy of gas molecules, which overcomes intermolecular forces.
In the gas-phase, substances can undergo various physical and chemical processes, such as evaporation, condensation, and combustion. Understanding gas-phase behavior is essential in fields like chemistry, meteorology, and engineering, as it helps explain phenomena ranging from weather patterns to the operation of engines.