The following mathematical and physical constants are available through the
h.PI 3.14159265358979323846 h.E 2.71828182845904523536 h.GAMMA 0.57721566490153286060 (Euler) h.DEG 57.29577951308232087680 (deg/radian) h.PHI 1.61803398874989484820 (golden ratio) h.FARADAY 96484.56 (coulombs/mole) (legacy value) h.FARADAY 96485.3321233100141 (modern value. derived from mole and electron charge) h.R 8.31441 (molar gas constant, joules/mole/deg-K) (legacy value) h.R 8.3144626181532395 (modern value. derived from boltzmann constant and mole) h.Avogadro_constant 6.02214076e23 (codata2018 value, introduced version 8.0)
As of Version 8.0 (circa October, 2020) modern units are the default.
Constants are not treated specially by the interpreter and
may be changed with assignment statements. However a change of
Avogadro_constant generate a warning message
Python warning messages can be managed with
import warnings; warnings.filterwarnings(action) where useful actions
If assignment takes
place due to execution of a hoc interpreter statement, the warning occurs
only once but cannot be avoided.
The legacy FARADAY is a bit different than the legacy faraday of the units database.
The legacy faraday in a
.mod mechanism is 96520.