Vapor
Vapor
Vapor (pronounced: /ˈveɪpər/), also spelled vapour, is a substance in the gas phase at a temperature lower than its critical temperature, which means that the vapor can be condensed to a liquid by increasing the pressure on it without reducing the temperature.
Etymology
The term "vapor" comes from the Latin word vapor, which means "steam, heat". It was first used in English in the 14th century, originally to denote a noxious or malodorous exhalation from the earth, similar to a miasma.
Related Terms
- Gas: A state of matter consisting of particles with enough kinetic energy to move freely and fill the volume of their container.
- Liquid: A state of matter with a definite volume but no fixed shape.
- Solid: A state of matter characterized by particles arranged such that their shape and volume are relatively stable.
- Phase transition: The process by which a substance changes from one state of matter to another, such as from a liquid to a gas (vapor).
- Condensation: The process by which a gas or vapor changes into a liquid.
- Evaporation: The process by which a liquid changes into a gas or vapor.
- Sublimation: The process by which a solid changes directly into a gas or vapor, without first becoming a liquid.
- Deposition: The process by which a gas or vapor changes directly into a solid, without first becoming a liquid.
External links
- Medical encyclopedia article on Vapor
- Wikipedia's article - Vapor
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