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In most literature, heat exchange is represented by 'Q', and heat exchange rates are represented by 'q' or either q or Q with dot '.' over it. However, Mathematica has an informal rule that custom variables (expressions) should not start with a capital letter, because such are reserved for Mathematica core.

The Webel `Pys`

library uses the following variables for field names (although, in displays and tables it can use rich Mathematica markup):

`qTot`

: Total heat exchange (energy).`qSen`

: Sensible heat exchange (energy), which cause a change in dry bulb temperature 'tdb'.`qLat`

: Latent heat due to water vaporisation (water gained by the humid air) or condensation (water lost by the humid air).

For heat **rates** (energy per time), `qDotTot`

, `qDotSen`

, and `qDotLat`

are used.

Note that this convention is adopted:

And in the Webel `Psy`

library and examples, systems are never considered to "contain heat":