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- Negative_temperature abstract "In physics, certain systems can achieve negative temperature; that is, their thermodynamic temperature can be expressed as a negative quantity on the Kelvin or Rankine scales. In colloquial usage, "negative temperature" may refer to temperatures that are expressed as negative numbers on the more familiar Celsius or Fahrenheit scales, with values that are colder than the zero points of those scales but still warmer than absolute zero. By contrast, a system with a truly negative temperature in absolute terms on the Kelvin scale is hotter than any system with a positive temperature. If a negative-temperature system and a positive-temperature system come in contact, heat will flow from the negative- to the positive-temperature system.That a system at negative temperature is hotter than any system at positive temperature is paradoxical if absolute temperature is interpreted as an average kinetic energy of the system. The paradox is resolved by understanding temperature through its more rigorous definition as the tradeoff between energy and entropy, with the reciprocal of the temperature, thermodynamic beta, as the more fundamental quantity. Systems with a positive temperature will increase in entropy as one adds energy to the system. Systems with a negative temperature will decrease in entropy as one adds energy to the system.Most familiar systems cannot achieve negative temperatures, because adding energy always increases their entropy. The possibility of decreasing in entropy with increasing energy requires the system to "saturate" in entropy, with the number of high energy states being small. These kinds of systems, bounded by a maximum amount of energy, are generally forbidden classically. Thus, negative temperature is a strictly quantum phenomenon. Some systems, however (see the examples below), have a maximum amount of energy that they can hold, and as they approach that maximum energy their entropy actually begins to decrease.".
- Negative_temperature thumbnail ColdnessScale.png?width=300.
- Negative_temperature wikiPageExternalLink si.
- Negative_temperature wikiPageID "362728".
- Negative_temperature wikiPageRevisionID "594378471".
- Negative_temperature align "right".
- Negative_temperature direction "vertical".
- Negative_temperature footer "Entropy, thermodynamic beta, and temperature as a function of the energy for a system of N noninteracting two–level particles.".
- Negative_temperature hasPhotoCollection Negative_temperature.
- Negative_temperature image "Negative_temperature_S_of_E.png".
- Negative_temperature image "Negative_temperature_T_of_E.png".
- Negative_temperature image "Negative_temperature_beta_of_E.png".
- Negative_temperature width "235".
- Negative_temperature subject Category:Laser_science.
- Negative_temperature subject Category:Magnetism.
- Negative_temperature subject Category:Plasma_physics.
- Negative_temperature subject Category:Temperature.
- Negative_temperature comment "In physics, certain systems can achieve negative temperature; that is, their thermodynamic temperature can be expressed as a negative quantity on the Kelvin or Rankine scales. In colloquial usage, "negative temperature" may refer to temperatures that are expressed as negative numbers on the more familiar Celsius or Fahrenheit scales, with values that are colder than the zero points of those scales but still warmer than absolute zero.".
- Negative_temperature label "Negative temperature".
- Negative_temperature label "Temperatura negativa".
- Negative_temperature label "Temperatura negativa".
- Negative_temperature label "Température négative".
- Negative_temperature label "Отрицательная абсолютная температура".
- Negative_temperature label "حرارة سالبة".
- Negative_temperature label "負温度".
- Negative_temperature label "负温度".
- Negative_temperature sameAs Αρνητική_θερμοκρασία.
- Negative_temperature sameAs Temperatura_negativa.
- Negative_temperature sameAs Température_négative.
- Negative_temperature sameAs Temperatura_negativa.
- Negative_temperature sameAs 負温度.
- Negative_temperature sameAs 음의_온도.
- Negative_temperature sameAs m.01_mg5.
- Negative_temperature sameAs Q2381834.
- Negative_temperature sameAs Q2381834.
- Negative_temperature wasDerivedFrom Negative_temperature?oldid=594378471.
- Negative_temperature depiction ColdnessScale.png.
- Negative_temperature isPrimaryTopicOf Negative_temperature.
