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en:materialdaten:dichtedaten_bzw._spezifisches_volumen [2025/03/27 14:29] – [Density function] cschallen:materialdaten:dichtedaten_bzw._spezifisches_volumen [2025/05/15 15:06] (aktuell) – [Theoretical basics] cschall
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 ======Density data or specific volume====== ======Density data or specific volume======
  
-===== Input dialogue =====+===== Material data - density ===== 
 + 
 +The following data of the material is entered in the ‘Density’ tab:
  
-The rheological data of the material is entered in the ‘Density’ tab: 
   * **Solids density**: The density of the compact solid   * **Solids density**: The density of the compact solid
   * **Bulk density**: The bulk density of the granulate or flakes. Is inevitably lower than the solid density   * **Bulk density**: The bulk density of the granulate or flakes. Is inevitably lower than the solid density
-  * **Calculation type**: Optionally density function (with 3 parameters) or volume function (with 2 parameters). See below for details.+  * **Calculation method**: Optionally density function (with 3 parameters) or volume function (with 2 parameters). See below for details.
  
 {{ :materialdaten:rex171_mat_en_003.png?nolink |}} {{ :materialdaten:rex171_mat_en_003.png?nolink |}}
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 Both the density and the specific volume as well as the glass transition or crystalline Both the density and the specific volume as well as the glass transition or crystalline
-melting point can be determined from the pvT-diagrams.+melting point can be determined from the pvT-diagram.
  
 {{ :materialdaten:abb_pvt_diagramm_en.svg?600 |}} {{ :materialdaten:abb_pvt_diagramm_en.svg?600 |}}
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 If only one density value is available, make sure that this value corresponds to the mass temperature in the process and that the gradient $\rho_m$ is zero. Otherwise, the value $ρ_0$ at $0 °C$ should be entered with the corresponding temperature dependence $\rho_m$. If only one density value is available, make sure that this value corresponds to the mass temperature in the process and that the gradient $\rho_m$ is zero. Otherwise, the value $ρ_0$ at $0 °C$ should be entered with the corresponding temperature dependence $\rho_m$.
  
-The compressibility $\kappa$ (order of magnitude 0.0001 1/bar, reciprocal of the compression modulus) influences the density as a function of the pressure:+The compressibility $\kappa$ (order of magnitude 0.0001 1/bar, reciprocal of the bulk modulus K) influences the density as a function of the pressure:
  
-$$ \kappa = - \frac{1}{V} \frac{dV}{dp} $$+$$ \kappa = \frac{1}{K} = - \frac{1}{V} \frac{dV}{dp} $$
 $$\text{with}$$ $$\text{with}$$
 $$\frac{dV}{V} = - \frac{d \rho}{\rho}$$ $$\frac{dV}{V} = - \frac{d \rho}{\rho}$$