The following mathematical and physical constants are built-in:

        "PI",   3.14159265358979323846,
        "E",    2.71828182845904523536,
        "GAMMA",0.57721566490153286060, /* Euler */
        "DEG", 57.29577951308232087680, /* deg/radian */
        "PHI",  1.61803398874989484820, /* golden ratio */
        "FARADAY", 96484.56,    /*coulombs/mole*/
        "R", 8.31441,           /*molar gas constant, joules/mole/deg-K*/


Constants are not treated specially by the interpreter and may be changed with assignment statements.

The FARADAY is a bit different than the faraday of the units database. The faraday in a .mod mechanism is 96520.