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| {{Thermodynamics|cTopic=[[Thermodynamic system|Systems]]}}
| | They call me Emilia. What I love doing is performing ceramics but I haven't made a dime with it. For many years I've been working as a payroll clerk. His family members lives in South Dakota but his spouse desires them to transfer.<br><br>Feel free to surf to my blog post :: [http://www.gaysphere.net/user/Z5147 at home std test] |
| An '''isenthalpic process''' or '''isoenthalpic process''' is a process that proceeds without any change in [[enthalpy]], ''H''; or [[Enthalpy#Specific enthalpy|specific enthalpy]], ''h''.<ref> {{cite book | last = Atkins | first = Peter
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| | authorlink = Peter Atkins
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| | coauthors = Julio de Paula
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| | title = Atkin's Physical Chemistry
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| | publisher = Oxford University Press
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| | date = 2006
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| | location = Oxford
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| | isbn = 978-0-19-870072-2
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| | page = 64}} </ref>
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| In a steady-state, steady-flow process, significant changes in pressure and temperature can occur to the fluid and yet the process will be isenthalpic if there is no transfer of heat to or from the surroundings, no work done on or by the surroundings, and no change in the kinetic energy of the fluid.<ref name="FCT">G.J. Van Wylen and R.E. Sonntag, ''Fundamentals of Classical Thermodynamics'', Section 5.13 (3rd edition)</ref> (If a steady-state, steady-flow process is analysed using a [[control volume]] everything outside the control volume is considered to be the '''surroundings.'''<ref>G.J. Van Wylen and R.E. Sonntag, ''Fundamentals of Classical Thermodynamics'', Section 2.1 (3rd edition)</ref>)
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| The [[Joule–Thomson effect|throttling process]] is a good example of an isenthalpic process. Consider the lifting of a relief valve or safety valve on a pressure vessel. The specific enthalpy of the fluid inside the pressure vessel is the same as the specific enthalpy of the fluid as it escapes from the valve.<ref name="FCT"/> With a knowledge of the [[Enthalpy#Specific enthalpy|specific enthalpy]] of the fluid, and the pressure outside the pressure vessel, it is possible to determine the temperature and speed of the escaping fluid.
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| In an isenthalpic process:
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| * <math>h_1=h_2</math>
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| * <math>dh = 0</math>
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| Isenthalpic processes on an [[ideal gas]] follow [[isothermal process|isotherms]] since <math>{d}h = 0=c_p{d}T</math>.
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| == See also ==
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| * [[Isentropic process]]
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| * [[Adiabatic process]]
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| ==References==
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| G.J. Van Wylen and R.E. Sonntag (1985), ''Fundamentals of Classical Thermodynamics'', John Wiley & Sons, Inc., New York ISBN 0-471-82933-1
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| ===Notes===
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| {{Reflist}}
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| [[Category:Thermodynamic processes]]
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| [[Category:Enthalpy]]
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| {{thermodynamics-stub}}
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| {{physics-stub}}
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