SDB - Thermo2

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Navigation: User Guide ➔ Species Properties ($SDB) ➔ Thermo2 Tab

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Thermo2 Tab

This tab page displays the following thermodynamic properties of ALL species in the project:

  • Entropy (Sf@T)
  • Gibbs Free Energy (Gf and DeltaGf)
  • The latter value [math]\displaystyle{ \Delta G_f }[/math] is the Gibbs Energy of Formation for a species - the difference [math]\displaystyle{ G_f - \sum G_f(e) }[/math]. where the sum is over the elements forming the species. For example, in electrolysis of water, it represents the theoretical minimum energy to dissociate to the components H2 and O2, at standard conditions 237kJ/mol. Heat must be added to overcome the change in entropy, so in practice the practical limit is 286 kJ/mol, which is the standard heat of formation.
  • Heating Values - This is the energy released if the compound is fully combusted with O2. The higher value is if the product contains liquid water while the lower value is if the product contains steam.
  • Entropy at 25°C (S25) - This is independent of the temperature setting at the top. (If the species has missing H25 data in the species database, then it will be marked with * and assumed a S value of 0 at 0°C.)
  • The lower (LoT) and upper (HiT) temperature limits for valid Cp data of individual compounds.

SDB Thermo2 138.png

  • The Species Property Data shown here is given for a temperature of 25°C and a pressure of 101.325 kPa.
  • The temperature (T) and pressure (P) can be changed to obtain species properties at different conditions.
  • Users can choose to display the data in either mass or mole basis. This is done via the Mass Basis check box, it toggles between the two options.
  • SpeciesShortButton.png and SpeciesLongButton.png: The SpeciesTag buttons toggles between the short and long species names.
  • SpeciesConfbutton.png: Pressing the CopytoClipboard button will add selected Properties Data onto the clipboard.
  • SpeciesPropertiesbutton.png: The Reports button allows the user to copy selected data onto the clipboard.
  • Button - Filter On.png and Button - Filter Off.png: These buttons allow the user to filter the species to display only species that meet certain criteria. See Species Filter for details on how the species filter is used.