Note that this registry only applies to symbolic algebra functions (which may also be invoked with numerical Real and Quantity values):

Note also that:

The final equations as shown are in some cases the result of self-consistent combinations of chained equations, i.e., the algebra is never repeated, thus adhering to the Single Source of Truth (SSOT) and Don't Repeat Yourself (DRY) principle.

Many of the lower level equations on fundamental properties are adapted from the following reference. The notations used in the Webel `Psy`

library are in some cases slightly different:

There is also a registry of the corresponding variables/quantities with their human-friendly markup symbols and documentation: