Енталпията е мярка за съдържанието на енергия в дадена термодинамична система. В литературата се обозначава с буквата H (heat content - съдържание на топлина от англ.) използва се мерната единица от СИ джаул[J]. В химията и термодинамиката се използват специфичната енталпия h[kJ/kg] и моларната енталпия hm[kJ/kmol].

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dbpedia-owl:abstract
  • Entalpía (del griego ἐνθάλπω [enthálpō], ‘agregar calor’; formado por ἐν [en], ‘en’ y θάλπω [thálpō], ‘calentar’) es una magnitud termodinámica, simbolizada con la letra H mayúscula, cuya variación expresa una medida de la cantidad de energía absorbida o cedida por un sistema termodinámico, es decir, la cantidad de energía que un sistema intercambia con su entorno.En la historia de la termodinámica se han utilizado distintos términos para denotar lo que hoy conocemos como entalpía de un sistema. Originalmente se pensó que la palabra «entalpía» fue creada por Émile Clapeyron y Rudolf Clausius a través de la publicación de la relación de Clausius-Clapeyron en The Mollier Steam Tables and Diagrams de 1827, pero el primero que definió y utilizó el término entalpía fue el holandés Heike Kamerlingh Onnes, a principios del siglo XX.En palabras más concretas, es una función de estado de la termodinámica donde la variación permite expresar la cantidad de calor puesto en juego durante una transformación isobárica (es decir, a presión constante) en un sistema termodinámico (teniendo en cuenta que todo objeto conocido puede ser entendido como un sistema termodinámico), transformación en el curso de la cual se puede recibir o aportar energía (por ejemplo la utilizada para un trabajo mecánico). En este sentido la entalpía es numéricamente igual al calor intercambiado con el ambiente exterior al sistema en cuestión.Usualmente la entalpía se mide, dentro del Sistema Internacional de Unidades, en joules.El caso más típico de entalpía es la llamada entalpía termodinámica. De ésta, cabe distinguir la función de Gibbs, que se corresponde con la entalpía libre, mientras que la entalpía molar es aquella que representa un mol de la sustancia constituyente del sistema.
  • Enthalpy is a defined thermodynamic potential, designated by the letter "H", that consists of the internal energy of the system (U) plus the product of pressure (P) and volume (V) of the system:Since enthalpy, H, consists of internal energy, U, plus the product of pressure (P) and the volume (V) of the system, which are all functions of the state of the thermodynamic system, enthalpy is a state function.The unit of measurement for enthalpy in the International System of Units (SI) is the joule, but other historical, conventional units are still in use, such as the British thermal unit and the calorie.The enthalpy is the preferred expression of system energy changes in many chemical, biological, and physical measurements, because it simplifies certain descriptions of energy transfer. Enthalpy change accounts for energy transferred to the environment at constant pressure through expansion or heating.The total enthalpy, H, of a system cannot be measured directly. The same situation exists in classical mechanics: only a change or difference in energy carries physical meaning. Enthalpy itself is a thermodynamic potential, so in order to measure the enthalpy of a system, we must refer to a defined reference point; therefore what we measure is the change in enthalpy, ΔH. The change ΔH is positive in endothermic reactions, and negative in heat-releasing exothermic processes. ΔH of a system is equal to the sum of non-mechanical work done on it and the heat supplied to it.For processes under constant pressure, ΔH is equal to the change in the internal energy of the system, plus the work that the system has done on its surroundings. This means that the change in enthalpy under such conditions is the heat absorbed (or released) by the material through a chemical reaction or by external heat transfer. Enthalpies for chemical substances at constant pressure assume standard state: most commonly 1 bar pressure. Standard state does not, strictly speaking, specify a temperature (see standard state), but expressions for enthalpy generally reference the standard heat of formation at 25 °C.Enthalpy of ideal gases and incompressible solids and liquids does not depend on pressure, unlike entropy and Gibbs energy. Real materials at common temperatures and pressures usually closely approximate this behavior, which greatly simplifies enthalpy calculation and use in practical designs and analyses.
  • Енталпията е мярка за съдържанието на енергия в дадена термодинамична система. В литературата се обозначава с буквата H (heat content - съдържание на топлина от англ.) използва се мерната единица от СИ джаул[J]. В химията и термодинамиката се използват специфичната енталпия h[kJ/kg] и моларната енталпия hm[kJ/kmol].
  • エンタルピー(英: enthalpy)とは、熱力学における示量性状態量のひとつである。熱含量ともいう。エンタルピーはエネルギーの次元をもち、物質の発熱・吸熱挙動にかかわる状態量である。等圧条件下にある系が発熱して外部に熱を出すとエンタルピーが下がり、吸熱して外部より熱を受け取るとエンタルピーが上がる。名称が似ているエントロピー(entropy)とは全く異なる物理量である。
  • L'entalpia posseduta da un sistema termodinamico (solitamente indicata con H) è una funzione di stato definita come la somma dell'Energia interna U e del prodotto della pressione p per il volume V:H = U + pVL'entalpia può essere espressa in joule (nel Sistema internazionale) oppure in calorie.A causa del fatto che non è possibile conoscere il valore assoluto dell'energia interna di un sistema o di una sostanza, durante una determinata trasformazione termodinamica si può misurare solo la variazione di entalpia (ΔH) e non il suo valore assoluto. In particolare: per una trasformazione isobara in cui si ha solo lavoro di tipo meccanico la variazione di entalpia è uguale al calore scambiato dal sistema con l'ambiente esterno; per una trasformazione isocorobarica (a volume e pressione costanti), la variazione di entalpia coincide sia col calore (Q) sia con la variazione di energia interna (ΔU) che si è avuta durante il processo; per una trasformazione isobaroentropica (a pressione ed entropia costanti), la variazione di entalpia esprime la variazione di energia libera.↑ 1,0 1,1
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  • Енталпията е мярка за съдържанието на енергия в дадена термодинамична система. В литературата се обозначава с буквата H (heat content - съдържание на топлина от англ.) използва се мерната единица от СИ джаул[J]. В химията и термодинамиката се използват специфичната енталпия h[kJ/kg] и моларната енталпия hm[kJ/kmol].
  • エンタルピー(英: enthalpy)とは、熱力学における示量性状態量のひとつである。熱含量ともいう。エンタルピーはエネルギーの次元をもち、物質の発熱・吸熱挙動にかかわる状態量である。等圧条件下にある系が発熱して外部に熱を出すとエンタルピーが下がり、吸熱して外部より熱を受け取るとエンタルピーが上がる。名称が似ているエントロピー(entropy)とは全く異なる物理量である。
  • Entalpi, maddenin yapısında depoladığı her türden enerjilerin toplamıdır. H ile simgelenir. Bir mol maddede depolanmış enerjiye o maddenin molar entalpisi denir.Maddelerin kesin entalpilerinin hesaplanması çok zordur. Bu yüzden çoğu çalışmalarda entalpi değeri olarak, maddenin değiştirilebilen ısı potansiyelinin kapsadığı termal entalpileri kullanılır.
  • Entalpía (del griego ἐνθάλπω [enthálpō], ‘agregar calor’; formado por ἐν [en], ‘en’ y θάλπω [thálpō], ‘calentar’) es una magnitud termodinámica, simbolizada con la letra H mayúscula, cuya variación expresa una medida de la cantidad de energía absorbida o cedida por un sistema termodinámico, es decir, la cantidad de energía que un sistema intercambia con su entorno.En la historia de la termodinámica se han utilizado distintos términos para denotar lo que hoy conocemos como entalpía de un sistema.
  • Enthalpy is a defined thermodynamic potential, designated by the letter "H", that consists of the internal energy of the system (U) plus the product of pressure (P) and volume (V) of the system:Since enthalpy, H, consists of internal energy, U, plus the product of pressure (P) and the volume (V) of the system, which are all functions of the state of the thermodynamic system, enthalpy is a state function.The unit of measurement for enthalpy in the International System of Units (SI) is the joule, but other historical, conventional units are still in use, such as the British thermal unit and the calorie.The enthalpy is the preferred expression of system energy changes in many chemical, biological, and physical measurements, because it simplifies certain descriptions of energy transfer.
  • L'entalpia posseduta da un sistema termodinamico (solitamente indicata con H) è una funzione di stato definita come la somma dell'Energia interna U e del prodotto della pressione p per il volume V:H = U + pVL'entalpia può essere espressa in joule (nel Sistema internazionale) oppure in calorie.A causa del fatto che non è possibile conoscere il valore assoluto dell'energia interna di un sistema o di una sostanza, durante una determinata trasformazione termodinamica si può misurare solo la variazione di entalpia (ΔH) e non il suo valore assoluto.
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  • Enthalpie
  • Entalpi
  • Entalpi
  • Entalpia
  • Entalpia
  • Entalpia
  • Entalpia
  • Entalpia
  • Entalpie
  • Entalpía
  • Enthalpie
  • Enthalpie
  • Enthalpy
  • Енталпия
  • Энтальпия
  • エンタルピー
  • 엔탈피
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