Notation

We use the following notation. Notations

Notation	Value	Type	Unit
	reference bulk modulus of the liquid at Psat and T	parameter	PaA
emm	effective molecular mass of vapor	parameter	g/mol
P	fluid current pressure	variable	PaA
Patm	atmospheric pressure: 1.013.105	constant	PaA
Psat	saturation pressure	parameter	PaA
	hight saturated vapor pressure	parameter	PaA
	low saturated vapor pressure	parameter	PaA
Ru	universal gas constant: 8.314	constant	J/mol/K
T	fluid current temperature	parameter	K
T0	reference fluid temperature: 273.15 K (0 degC)	constant	K
V	volume	variable	m3
x	volumetric air/gas content	parameter	%
α	slope of bulk modulus	parameter	%
θ	volumetric fraction of undissolved air/gas	variable	null
	absolute viscosity of air/gas	parameter	cP
	reference absolute viscosity of liquid at Psat and T	parameter	cP
μfluid	fluid absolute viscosity at current P and T	variable	cP
	absolute viscosity of vapor	parameter	cP
	density of air/gas at Patm and 273 K	parameter	kg/m3
	fluid density at current pressure P and T	variable	kg/m3
	reference density of the liquid at Patm and 273K	parameter	kg/m3
Γ	polytropic index for air/gas/vapor content	parameter	null
	mass fraction of vapor	variable	null

All the pressures (and bulk modulus) and temperatures in the following formulae are taken to be absolute (PaA and K).

Fluid refers to a mixture of liquid, dissolved or free air/gas and vapor (vaporized liquid).