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--- en:materialdaten:dichtedaten_bzw._spezifisches_volumen [2024/10/17 17:18] – [Compressibility factor kappa] neelest
+++ en:materialdaten:dichtedaten_bzw._spezifisches_volumen [2026/09/17 10:09] (aktuell) – gelöscht - Externe Bearbeitung (Unbekanntes Datum) 127.0.0.1
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-======Density data or specific volume======
-{{ :materialdaten:rex171_mat_en_003.png?nolink |}}
-===== Density data or specific volume =====
-Both the density and the specific volume as well as the glass transition or crystalline
-melting point can be determined from the pvT-diagrams.
-{{ :materialdaten:abb_pvt_diagramm_en.svg?600 |}}
-Here, the crystalline melting point $T_K$ is defined by the point of inversion of the
-specific volume function in the pvT-diagram. The glass transition point $T_G$ can be
-determined as the point of intersection of the tangents to the upper and lower volume
-function. The temperature-dependent density of the melt is described by the following
-straight-line equation:
-**Density function:**  \[ρ = ρ_0 - ρ_m \cdot T\]
-If only one density value is available, it must be ensure that this value corresponds to
-the melt temperature. Otherwise the value $ρ_0$ at $0 °C$ should be entered. In
-order to simplify the data input it is alternatively possible to enter a temperaturedependent change in the specific volume $v$ by aid of a switch.
-**Volume function:** \[v = v_0 + v_m \cdot T\]
-The two characteristic values $v_0$ und $v_m$ can also be established by the pvT-diagram. The values are to be established at a medium pressure corresponding
-to the process.
-==== Compressibility factor kappa ====
-The compressibility factor kappa influences the specific volume or rather the density
-in dependence of the pressure. The value refers to an average temperature and an
-average pressure of the pvT-data. Changing the specific volume by the pressure is
-described with the following equation.
-\[kappa = - \frac{1}{v} (\frac{dv}{dp}) _{T=const}\]
-The value kappa can be imported directly from PAM or entered manually. If 0 is
-entered as the value for kappa, the specific volume or rather the pressure is
-calculated without considering the pressure.
-In addition to this, the solid and bulk density can be entered.
-===Further topics===
-  * [[en:materialdaten:datenbankanbindung_an_pam|]]
-  * [[en:materialdaten:allgemeineangaben|]]
-  * [[en:materialdaten:rheologische_materialdaten|]]
-  * [[en:materialdaten:thermodynamische_daten|]]
-  * [[en:materialdaten:dichtedaten_bzw._spezifisches_volumen|]]
-  * [[en:materialdaten:tribologische_daten|]]
-  * [[en:materialdaten:technologische_daten|]]
-  * [[en:materialdaten:molekulargewicht|]]
-  * [[en:materialdaten:faserabbau|]]
-  * [[en:materialdaten:eingabe_von_mischungen|]]
-  * [[en:materialdaten:polymer-polymer_mischung|]]
-  * [[en:materialdaten:gefuelltes_polymer|]]