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The Observed Properties of Liquid Helium
at the Saturated Vapor Pressure

CNomenclature

Symbol or expression	Physical quantity	Unit symbol or value
m	4He mass	6.646 x10-24 g
k	Boltzmann’s constant	1.389658x10-23J/K
hi(h)	Planck’s constant,	6.6260755x10-34J•s (1.05457266x10-34J•s)
P	Pressure	1.01325x105Pascal
V	Molar volume	cm3/mole
T	Temperature
PVT	Pressure-Volume-Temperature, the equation of state
SVP	Saturated vapor pressure
T(P)	The temperature at which liquid helium-4 becomes a superfluid for a given pressure	k
helium I (He I)	The non-superfluid state of liquid helium-4, T > T
helium II (He II)	The superfluid state of liquid helium-4, T < T
P	Density	g•cm•s-3
Pu	Density of the normal component	g•cm•s-3
Ps	Density of the superfluid component	g•cm•s-3
/k	Energy of an excitation k	k
w=/h	Frequency of an excitation	rad.s-1
p	Excitation momentum
q=p/h	Wave number of excitation	Å-1(1Å-1=1010m-1)
p0	Momentum at the roton minimum	g•cm•s-1
pc	Momentum at which d/dp=h	g•cm•s-1
n(p)	Distribution of excitations as a function of momentum	cm-3