Talk:State postulate
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The link to 'multiphase systems' links to an article about electricity transmission. 68.231.194.95 (talk) 04:45, 14 December 2015 (UTC)
what does it mean by the two intensive properties specifying the state of the system?
This is a weakened form of Gibbs' Phase Rule, from Gibbs' book about heterogeneous systems. Any confusion about this, which is bizarrely called a postulate, would be cleared up by reading Gibbs' book about heterogeneous systems, or certain more recent work by Jaynes. eigenlambda (talk) 15:38, 15 June 2016 (UTC)
peculiar statement leaks from here to another article
[edit]Indeed Çengel & Boles (2015) do write their state postulate as quoted in the article: The state postulate says:
| “ | The state of a simple compressible system is completely specified by two independent, intensive properties[1] | ” |
But it isn't the usual thermodynamic view. The usual thermodynamic view demands at least one extensive state variable in addition to a suitable list of intensive variables. The state includes the total extent of the system.
It is regrettable that this peculiar view offered by Çengel & Boles (2015) has leaked into the article on Intensive and extensive properties, as
- The distinction between intensive and extensive properties has some theoretical uses. For example, in thermodynamics, according to the state postulate: "The state of a simple compressible system is completely specified by two independent, intensive properties". Other intensive properties are derived from those two variables.Chjoaygame (talk) 06:21, 13 July 2020 (UTC)
- ^ Cengel, Yunus A.; Boles, Michael A. (2008). Thermodynamics: an engineering approach. New York, NY: McGraw-Hill. ISBN 0-07-238332-1.