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Volumetric heat capacity (VHC), also termed volume-specific heat capacity, describes the ability of a given volume of a substance to store internal energy while undergoing a given temperature change, but without undergoing a phase transition. It is different from specific heat capacity in that the VHC is a 'per unit volume' measure of the relationship between thermal energy and temperature of a material, while the specific heat is a 'per unit mass' measure (or occasionally per molar quantity of the material). If given a specific heat value of a substance, one can convert it to the VHC by multiplying the specific heat by the density of the substance.

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  • Volumetric heat capacity
  • سعة حرارية حجمية
  • Wärmespeicherzahl
  • Capacidad calorífica volumétrica
  • Capacité thermique volumique
  • Inércia térmica
  • Объёмная теплоёмкость
  • 容積熱容
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  • Die Wärmespeicherzahl mit der physikalischen Einheit J/(m³·K) ist die auf das Volumen bezogene Wärmekapazität eines Festkörpers: Sie errechnet sich aus der spezifischen Wärmekapazität durch Multiplikation mit der Dichte : Beispiel für Baustahl: Die Wärmespeicherzahl ist eine wichtige Eigenschaft von Dämmstoffen und eine entscheidende Größe bei der Auslegung von Kühlkörpern konstanten Bauvolumens.
  • 容積熱容是指物體在溫度改變而沒有變相之下的儲熱能力。與比熱不同之處是它視乎物體的容積,而比熱則視乎物體的質量。根據物體的比熱,我們可以利用物體的密度得出容積熱容。 
  • Volumetric heat capacity (VHC), also termed volume-specific heat capacity, describes the ability of a given volume of a substance to store internal energy while undergoing a given temperature change, but without undergoing a phase transition. It is different from specific heat capacity in that the VHC is a 'per unit volume' measure of the relationship between thermal energy and temperature of a material, while the specific heat is a 'per unit mass' measure (or occasionally per molar quantity of the material). If given a specific heat value of a substance, one can convert it to the VHC by multiplying the specific heat by the density of the substance.
  • 25بك المحتوى هنا ينقصه الاستشهاد بمصادر. يرجى إيراد مصادر موثوق بها. أي معلومات غير موثقة يمكن التشكيك بها وإزالتها. (مارس 2016) السعة الحرارية الحجمية في الكيمياء (بالإنجليزية: volumetric heat capacity ) أو عدد السعة الحرارية لدى المهندسين ، هي وحدة فيزيائية [ جول/متر مكعب/كلفن ] وهي تعبر عن السعة الحرارية لوحدة الحجم من المادة ، حيث وحدة الحجم هي متر مكعب. وهي تحتسب من الحرارة النوعية عن طريق ضربها في كثافة المادة ، طبقا للمعادلة : s = عدد السعة الحراريةc = الحرارة النوعية = كثافة المادة مثال : يالنسبة لنوع الحديد المستخدم مع الخرسانة في المباني : حيث الوحدة هنا كيلوجول/ متر مكعب/ كلفن.
  • La capacidad calorífica volumétrica describe la capacidad de cierto volumen de una sustancia para almacenar calor al experimentar un cierto cambio en su temperatura sin cambiar de fase. Se diferencia del calor específico en que está determinado por el volumen del material, mientras que el calor específico está basado en la masa del material. Se puede obtener la capacidad calorífica volumétrica de una substancia al multiplicar el calor específico por su densidad.
  • La capacité thermique volumique ou chaleur volumique d'un matériau est sa capacité à emmagasiner la chaleur par rapport à son volume. Elle est définie par la quantité de chaleur nécessaire pour élever de 1 °C, la température de un mètre cube de matériau. C'est donc une grandeur intensive égale à la capacité thermique rapportée au volume du corps étudié. C'est le produit de la masse volumique (ρ) d'un matériau et de sa capacité thermique massique (ou chaleur spécifique, Cp). Elle s'exprime en joule par mètre cube-kelvin J⋅m-3⋅K-1. On la retrouve quelquefois exprimée en W⋅h⋅m-3⋅K-1.
  • Inércia térmica é um termo comumente utilizado por arquitetos e engenheiros quando se referem às transferências de calor e sua capacidade térmica volumétrica (ou capacidade calorífica volumétrica). Por exemplo, tal material possui uma alta inércia térmica. A inércia térmica é modelada como uma função da densidade, calor específico e capacidade térmica de um material.
  • Объёмная теплоёмкость характеризует способность данного объёма данного конкретного вещества увеличивать свою внутреннюю энергию при изменении температуры вещества (подразумевая отсутствие фазового перехода). Равна отношению теплоёмкости данного образца вещества к его объему: Объёмная теплоёмкость отличается от удельной теплоёмкости, которая характеризует способность единицы массы данного вещества увеличивать свою внутреннюю энергию при изменении температуры. Можно преобразовать удельную теплоёмкость в объёмную путём умножения удельной теплоёмкости на плотность вещества: где
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  • Volumetric heat capacity (VHC), also termed volume-specific heat capacity, describes the ability of a given volume of a substance to store internal energy while undergoing a given temperature change, but without undergoing a phase transition. It is different from specific heat capacity in that the VHC is a 'per unit volume' measure of the relationship between thermal energy and temperature of a material, while the specific heat is a 'per unit mass' measure (or occasionally per molar quantity of the material). If given a specific heat value of a substance, one can convert it to the VHC by multiplying the specific heat by the density of the substance. Dulong and Petit predicted in 1818 that the product of solid substance density and specific heat capacity (ρcp) would be constant for all solids. This amounted to a prediction that volumetric heat capacity in solids would be constant. In 1819 they found that volumetric heat capacities were not quite constant, but that the most constant quantity was the heat capacity of solids adjusted by the presumed weight of the atoms of the substance, as defined by Dalton (the Dulong–Petit law). This quantity was proportional to the heat capacity per atomic weight (or per molar mass), which suggested that it is the heat capacity per atom (not per unit of volume) which is closest to being a constant in solids. Eventually (see the discussion in heat capacity) it became clear that heat capacities per particle for all substances in all states are the same, to within a factor of two, so long as temperatures are not in the cryogenic range. For very cold temperatures, heat capacities fall drastically and eventually approach zero as temperature approaches zero. The heat capacity on a volumetric basis in solid materials at room temperatures and above varies more widely, from about 1.2 MJ/m³K (for example bismuth) to 3.5 MJ/m³K (for example iron), but this is mostly due to differences in the physical size of atoms. See a discussion in atom. Atoms vary greatly in density, with the heaviest often being more dense, and thus are closer to taking up the same average volume in solids than their mass alone would predict. If all atoms were the same size, molar and volumetric heat capacity would be proportional and differ by only a single constant reflecting ratios of the atomic-molar-volume of materials (their atomic density). An additional factor for all types of specific heat capacities (including molar specific heats) then further reflects degrees of freedom available to the atoms composing the substance, at various temperatures. For most liquids, the volumetric heat capacity is narrower, for example octane at 1.64 MJ/m³K or ethanol at 1.9. This reflects the modest loss of degrees of freedom for particles in liquids as compared with solids. However, water has a very high volumetric heat capacity, at 4.18 MJ/m³K, and ammonia is also fairly high (3.3). For gases at room temperature, the range of volumetric heat capacities per atom (not per molecule) only varies between different gases by a small factor less than two, because every ideal gas has the same molar volume. Thus, each gas molecule occupies the same mean volume in all ideal gases, regardless of the type of gas (see kinetic theory). This fact gives each gas molecule the same effective "volume" in all ideal gases (although this volume/molecule in gases is far larger than molecules occupy on average in solids or liquids). Thus, in the limit of ideal gas behavior (which many gases approximate except at low temperatures and/or extremes of pressure) this property reduces differences in gas volumetric heat capacity to simple differences in the heat capacities of individual molecules. As noted, these differ by a factor depending on the degrees of freedom available to particles within the molecules.
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