Properties of Vapor
- Vapor refers to a gas phase at a temperature where the same substance can also exist in the liquid or solid state, below the critical temperature of the substance.
- Gas refers to a compressible fluid phase.
- Fixed gases are gases for which no liquid or solid can form at the temperature of the gas.
- A liquid or solid does not have to boil to release a vapor.
- Vapor is responsible for cloud formation and condensation.
Vapor Pressure
- The vapor pressure is the equilibrium pressure from a liquid or a solid at a specific temperature.
- The equilibrium vapor pressure of a liquid or solid is not affected by the amount of contact with the liquid or solid interface.
- The normal boiling point of a liquid is the temperature at which the vapor pressure is equal to normal atmospheric pressure.
- For two-phase systems, the vapor pressure of the individual phases are equal.
- The vapor pressure follows Raoults law in the absence of stronger inter-species attractions between molecules.
Examples of Vapor
- Invisible water vapor condenses to form visible water droplets called mist.
- Perfumes contain chemicals that vaporize at different temperatures and rates.
- Atmospheric water vapor can condense into small liquid droplets and form fog, mist, and haar.
- Mercury-vapor lamps and sodium vapor lamps produce light from excited states of atoms.
- Flammable liquids do not burn when ignited, but the vapor cloud above the liquid can burn within certain concentration limits.
Measuring Vapor
- The amount of vapor present is quantified by the partial pressure of the gas.
- Vapors obey the barometric formula in a gravitational field.
- Vapor can be measured using various techniques and instruments.
- Vapor concentration can be determined for different purposes, such as safety assessments or chemical analysis.
- Vapor measurements are important in understanding atmospheric conditions and industrial processes.
Related Concepts
- Contrails, also known as vapor trails, are long, thin artificial clouds formed behind aircraft.
- Dilution is a chemistry concept related to vapor.
- Evaporation is a type of vaporization that occurs from the surface of a liquid.
- Henry's law is a gas law that relates to the proportionality of dissolved gas.
Vapor Data Sources
Reference | URL |
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Glossary | https://www.alternix.com/blogs/glossary-of-terms/vapor |
Wikipedia | http://en.wikipedia.org/wiki/Vapor |
Wikidata | https://www.wikidata.org/wiki/Q255722 |
Knowledge Graph | https://www.google.com/search?kgmid=/m/07zqg |