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The inversion temperature in thermodynamics and cryogenics is the critical temperature below which a non-ideal gas (all gases in reality) that is expanding at constant enthalpy will experience a temperature decrease, and above which will experience a temperature increase. This temperature change is known as the Joule–Thomson effect, and is exploited in the liquefaction of gases. Inversion temperature depends on the nature of the gas. For a van der Waals gas we can calculate the enthalpy using statistical mechanics as ,

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rdf:type	species yago:ChemicalPhenomenon111409059 yago:Gas114481080 yago:NaturalPhenomenon111408559 yago:Phenomenon100034213 yago:PhysicalEntity100001930 yago:Process100029677 yago:WikicatGases yago:WikicatIndustrialGases yago:StateOfMatter114479615
rdfs:label	درجة حرارة ارتكاس (ar) Inversion temperature (en)
rdfs:comment	درجة حرارة الارتكاس (في التحريك الحراري) هي درجة الحرارة الحرجة التي يفصل بين ظاهرتين تتجليا عند غاز حقيقي في عملية متساوية السخانة: * تحتها تنقص درجة حرارة الغاز * فوقها تزداد درجة حرارة الغاز تسمى هذه الظاهرة « تأثير جول-طومسون » وهي ذات أهمية خاصة في التبريد العميق وتسييل الغازات. (ar) The inversion temperature in thermodynamics and cryogenics is the critical temperature below which a non-ideal gas (all gases in reality) that is expanding at constant enthalpy will experience a temperature decrease, and above which will experience a temperature increase. This temperature change is known as the Joule–Thomson effect, and is exploited in the liquefaction of gases. Inversion temperature depends on the nature of the gas. For a van der Waals gas we can calculate the enthalpy using statistical mechanics as , (en)
dct:subject	Gases Thermodynamic properties Engineering thermodynamics Industrial gases Temperature
Wikipage page ID	14066275 (xsd:integer)
Wikipage revision ID	1096383386 (xsd:integer)
Link from a Wikipage to another Wikipage	Joule–Thomson effect Van der Waals equation Gases Critical point (thermodynamics) Clark University Energy Enthalpy Critical temperature Cryogenics Thermodynamic properties Liquefaction of gases Engineering thermodynamics Thermodynamics Statistical mechanics Industrial gases Temperature Phase transition Work (thermodynamics) Ideal gas Boltzmann's constant Kelvin scale
Link from a Wikipage to an external page	http://stp.clarku.edu/notes/chap2.pdf
sameAs	Inversion temperature Inversion temperature Inversion temperature Inversion temperature Inversion temperature Inversion temperature Inversion temperature Inversion temperature
dbp:wikiPageUsesTemplate	dbt:Reflist
has abstract	درجة حرارة الارتكاس (في التحريك الحراري) هي درجة الحرارة الحرجة التي يفصل بين ظاهرتين تتجليا عند غاز حقيقي في عملية متساوية السخانة: * تحتها تنقص درجة حرارة الغاز * فوقها تزداد درجة حرارة الغاز تسمى هذه الظاهرة « تأثير جول-طومسون » وهي ذات أهمية خاصة في التبريد العميق وتسييل الغازات. (ar) The inversion temperature in thermodynamics and cryogenics is the critical temperature below which a non-ideal gas (all gases in reality) that is expanding at constant enthalpy will experience a temperature decrease, and above which will experience a temperature increase. This temperature change is known as the Joule–Thomson effect, and is exploited in the liquefaction of gases. Inversion temperature depends on the nature of the gas. For a van der Waals gas we can calculate the enthalpy using statistical mechanics as where is the number of molecules, is volume, is temperature (in the Kelvin scale), is Boltzmann's constant, and and are constants depending on intermolecular forces and molecular volume, respectively. From this equation, we note that if we keep enthalpy constant and increase volume, temperature must change depending on the sign of . Therefore, our inversion temperature is given where the sign flips at zero, or , where is the critical temperature of the substance. So for , an expansion at constant enthalpy increases temperature as the work done by the repulsive interactions of the gas is dominant, and so the change in kinetic energy is positive. But for , expansion causes temperature to decrease because the work of attractive intermolecular forces dominates, giving a negative change in average molecular speed, and therefore kinetic energy. (en)
gold:hypernym	Temperature
prov:wasDerivedFrom	wikipedia-en:Inversion_temperature?oldid=1096383386&ns=0
page length (characters) of wiki page	2553 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Inversion_temperature
is Link from a Wikipage to another Wikipage of	Joule–Thomson effect Van der Waals equation Index of physics articles (I) List of materials properties Redlich–Kwong equation of state
is foaf:primaryTopic of	wikipedia-en:Inversion_temperature

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