Introduction

The casual user has no need to explicitly call this module.

.constants contains physical constants required by Pytzer.

Universal constants

Variable	Description	Value	Unit	Source
Mw	Molar mass of water	0.018015	kg·mol−1	PubChem
R	Universal gas constant	8.3144598	J·mol−1·K−1	CODATA
F	Faraday constant	96485.33289	C·mol−1	CODATA
NA	Avogadro's constant	6.0221367×1023	mol−1

Pitzer model parameters

Variable	Description	Value	Unit	Source
b	b parameter	1.2	kg1/2·mol−1/2	Pitzer (1991)

Unit conversion factors

Variable	Description	Value	Unit
cal2J	Energy: calories per Joule	4.184	cal·J−1
Patm_bar	Pressure: atmosphere to bar	1.01325	bar·atm−1
atm2Pa	Pressure: atmosphere to Pascal	101325	Pa·atm−1
Torr2Pa	Pressure: Torr to Pascal	atm2Pa / 760	Pa·Torr−1
mmHg2Pa	Pressure: mmHg to Pascal	133.322387415	Pa·mmHg−1