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Physics
Classical Physics
Thermodynamics
How can heat change be measured under constant pressure?
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[QUOTE="DrStupid, post: 6029360, member: 352329"] No, it isn't. Enthalpy is fedined as [itex]H = U + p \cdot V[/itex] Yes that's correct and the reason for the definition of enthalpy. Calorimetirc measurements of internal energy would require constant volume which is much harder to achieve. I'm afraid your understanding is not correct. Change of enthalpy is measured in terms of exchanged heat under constant pressure. Expansion is just a possible side effect of the constant pressure and irrelevant for the measurement. No. Under constant pressure they differ by the volumetric work. [/QUOTE]
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Physics
Classical Physics
Thermodynamics
How can heat change be measured under constant pressure?
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