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In thermal physics and thermodynamics, the heat capacity ratio, also known as the adiabatic index, the ratio of specific heats, or Laplace's coefficient, is the ratio of the heat capacity at constant pressure (CP) to heat capacity at constant volume (CV).
The units of specific heat capacity are J/(kg °C) or equivalently J/(kg K). The heat capacity and the specific heat are related by \(\mathrm{C=cm}\) or \(\mathrm{c=\frac{C}{m}}\). The mass m, specific heat c, change in temperature ΔT, and heat added (or subtracted) Q are related by the equation: \(\mathrm{Q=mcΔT}\).
We can therefore use our definition of specific heat from Equation (2.4) to define the specific heat for a constant volume process, The Specific Heat at Constant Pressure. If we write , and consider a constant pressure process, we can perform a similar derivation to the one above and show that.
The SI unit for specific heat capacity is joule per kelvin per kilogram J / kg⋅K , J⋅K −1 ⋅kg −1. Since an increment of temperature of one degree Celsius is the same as an increment of one kelvin, that is the same as joule per degree Celsius per kilogram: J/(kg⋅°C).
The SI unit for specific heat is J/(kg × K) J / (k g × K) or J/(kg×o C) J / (k g × o C). (Recall that the temperature change ΔT Δ T is the same in units of kelvin and degrees Celsius.) Values of specific heat must generally be measured, because there is no simple way to calculate them precisely.
2 Μαΐ 2024 · cp = cv + R. The specific heat constants for constant pressure and constant volume processes are related to the gas constant for a given gas. This rather remarkable result has been derived from thermodynamic relations, which are based on observations of physical systems and processes.
30 Ιουλ 2024 · Specific heat is the amount of thermal energy you need to supply to a sample weighing 1 kg to increase its temperature by 1 K. 💡 This calculator works in various ways, so you can also use it to, for example, calculate the heat needed to cause a temperature change (if you know the specific heat).
