Webel: Psy/MPsy: Psychrometrics for Mathematica: A suffix '$g' in a water-related variable name refers to water vapour (a special case of gas) or steam. A suffix '$f' refers to liquid (fluid) water. [Although a gas is a fluid.]

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CONVENTION

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STRONG

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Formally, a gas is a fluid (one that is not a liquid), but the use of the suffix '$f' in variable and expression names when dealing with water-related Psychrometrics quantities typically implies that one is dealing with liquid (fluid) water.

The use of 'g' and 'f' subscripts in formulae is common in many references, but some use 'v' for water vapour and 'l' for liquid water, which is more consistent (because there is no confusion concerning "fluid") but it is slightly less commonly used in Psychrometrics.

Note also that:

Webel: Psy/MPsy: Psychrometrics for Mathematica: The term 'steam' (indicated in variable names with a suffix '$s') is reserved for water vapour created through boiling.

The distinction between 'vapour' and "just gas" is:

Wikipedia: 'In physics, a vapor or vapour is a substance in the gas phase at a temperature which means that the vapor can be condensed to a liquid by increasing the pressure on it without reducing the temperature of the vapor.'

Wikipedia: 'Vapor refers to a gas phase at a temperature where the same substance can also exist in the liquid or solid state, below the critical temperature of the substance.'

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