Talk:Q180241
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Autodescription — internal energy (Q180241)
description: energy contained in a system, excluding energy due to its position as a body in external force fields or its overall motion
- Useful links:
- View it! – Images depicting the item on Commons
- Report on constraint conformation of “internal energy” claims and statements. Constraints report for items data
For help about classification, see Wikidata:Classification.
- Parent classes (classes of items which contain this one item)
- internal energy (Q180241)
- Subclasses (classes which contain special kinds of items of this class)
- ⟨
internal energy⟩ on wikidata tree visualisation (external tool)(depth=1) - Generic queries for classes
- See also
- This documentation is generated using
{{Item documentation}}.
Instance or subclass of thermodynamic potential?[edit]
@Infovarius: We currently have this situation:
- internal energy (Q180241) is a subclass of physical quantity (Q107715)
- internal energy (Q180241) is an instance of thermodynamic potential (Q2420179)
- thermodynamic potential (Q2420179) is a subclass of scalar quantity (Q181175) which is a subclass of physical quantity (Q107715)
This implies that internal energy (Q180241) is both a subclass and an instance of physical quantity (Q107715). 1. is correct (according to Wikidata's current model of quantities), so either 2. or 3. need a fix. Toni 001 (talk) 22:02, 20 February 2020 (UTC)
- The following interpretation follows the model of other quantities:
- internal energy of system A instance of internal energy subclass of thermodynamic potential subclass of physical quantity.
- This is just like:
- 3 V/m instance of electric field strength subclass of field strength subclass of physical quantity.
- Therefore I think that all of those thermodynamic potentials should be subclasses of thermodyanic potential. Toni 001 (talk) 08:29, 21 February 2020 (UTC)
- In this case both thermodynamic free energy (Q1146448) and Helmholtz free energy (Q865821) are subclasses of thermodynamic potential (Q2420179) which seems wrong. Don't you see a difference between them? (General and particular). --Infovarius (talk) 22:57, 22 February 2020 (UTC)
- None of those items which are now subclasses of thermodynamic potential (Q2420179) are individual quantities. Individual quantities are things like "free energy of system A", "Helmholtz energy of system B", .... Instead, those are quantity classes, also known as "kinds of quantities", like "length", "mass" (as opposed to "length of stick 1", "mass of sample 2", ...). Toni 001 (talk) 12:53, 23 February 2020 (UTC)
- In this case both thermodynamic free energy (Q1146448) and Helmholtz free energy (Q865821) are subclasses of thermodynamic potential (Q2420179) which seems wrong. Don't you see a difference between them? (General and particular). --Infovarius (talk) 22:57, 22 February 2020 (UTC)