Amount of of heat to to be supplied to a given amount of a material to produce a unit change in its its temperature:
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C = \frac{\delta Q}{\delta T} |
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Heat Capacity depends on the way the heat is is transferred and as such is not a table property of the matter.
The two major heat transfer processes are isobaric and isohoric which resylt result in different values of heat capacity:
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Both
and LaTeX Math Inline body C_P
are proportional to the amount of chemical substance involved in a heat transfer process and as such are not the material properties.LaTeX Math Inline body C_V
The ratio
is called a Heat Capacity Ratio (γ) or Adiabatic Index (γ) or Isentropic expansion factor (κ) and is a material property.LaTeX Math Inline body \gamma = C_P/C_V
Based on Mayer's relation the Isobaric heat capacity is always greater than Isochoric heat capacity:
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C_P \geq C_V |
One can relate them to material properties through the known material mass
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Overall, there are totally six different different intensive physical properties related to heat capacity material measures:
| Molar Heat Capacity | Specific heat capacity | Volumetric Heat Capacity | ||||||||||||||||||||||
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| Isobaric (V= const) |
| Isobaric specific heat capacity
| Isobaric volumetric heat capacity
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| Isochoric (P = const) |
| Isochoric specific heat capacity
| Isochoric volumetric heat capacity
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See also
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Physics / Thermodynamics / Thermodynamic process / Heat Transfer
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[ Specific heat capacity ] [ Volumetric Heat Capacity ][ Molar Heat Capacity ][ Mayer's relation ]