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Steam Table Nomenclature

  1. Jun 30, 2014 #1
    I'm curious as to why steam tables typically present liquid properties with an "f" subscript, such as ρf.The gas properties use a "g" subscript, so I would expect the liquid properties to use "l". My first guess at the meaning of the "f" would be that it means "fluid", but this wouldn't make sense since both liquids and gases are subcategories of fluids. Am I missing something obvious?

    Some examples:
    http://www.spiraxsarco.com/us/resources/steam-tables/sub-saturated-water.asp
    http://www.efunda.com/materials/water/steamtable_sat.cfm
    ASME steam tables are also presented this way but I can't find any free examples online.
     
  2. jcsd
  3. Jun 30, 2014 #2

    SteamKing

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    'l' can be mistaken for a number of different things, like the numeral one for example. 'f' means fluid, specifically the properties of the substance in the liquid phase. Think of it as a special convention for presenting thermodynamic data.
     
  4. Jun 30, 2014 #3
    Thanks for the reply. I admit the 'l' isn't terribly clear in this font, but a little forthought in font choice could prevent the ambiguity. Personally, I find the 'f' more confusing, but maybe that's just me. It seems just as silly to use an 'm' subscript for the liquid phase since liquids are composed of matter.
     
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