CONSTANT Function (PV-WAVE Advantage)

units—Scalar string specifying the units of the desired constant. If empty, then Systeme International d’Unites (SI) units are assumed. The case of the characters is not relevant when specifying units, i.e., character strings “METER”, “Meter”, and “meter” are equivalent. Parameter units has the form “U1*U2*...*Um/V1/.../Vn,” where Ui and Vi are the names of basic units or the names of basic units raised to a power. Basic units must be separated by * or /. Powers are indicated by ^, as in “m^2” for m2. Examples are “METER*KILOGRAM/SECOND”, “M*KG/S”, “METER”, or “M/KG^2”.

The names allowed are listed in Table 13-1: Constant Names on page 682. Values marked with (mp) are exact (to machine precision). The references in the right-hand column are indicated by code numbers: (1) for Cohen and Taylor (1986), (2) for Liepman (1964), and (3) for precomputed mathematical constants. The supported units are listed in Table 13-2: Supported Units on page 683.

Table 13-1: Constant Names
Name	Description	Value	Ref.
amu	atomic mass unit	1.6605655 × 10–27 kg	1
ATM	standard atm. pressure	1.01325 × 105 N/m2 (mp)	2
AU	astronomical unit	1.496 × 1011 m
Avogadro	Avogadro’s number, N	6.022045 × 1023 1/mole	1
Boltzman	Boltzman’s constant, k	1.380662 × 10–23 J / K	1
C	speed of light, c	2.997924580 × 108 m/s	1
Catalan	Catalan’s constant	0.915965... (mp)	3
E	base of natural logs, e	2.718... (mp)	3
ElectronCharge	electron charge, e	1.6021892 × 10–19 C	1
ElectronMass	electron mass, me	9.109534 × 10–31 kg	1
ElectronVolt	electron volt, ev	1.6021892 × 10–19 J	1
Euler	Euler’s constant, γ	0.577... (mp)	3
Faraday	Faraday constant, F	9.648456 × 104 C/mole	1
FineStructure	fine structure, α	7.2973506 × 10–3	1
Gamma	Euler’s constant, γ	0.577... (mp)	3
Gas	gas constant, R0	8.31441 J/mole/K	1
Gravity	gravitational constant, G	6.6720 × 10–11 N m2 / kg2	1
Hbar	Planck’s constant / 2π	1.0545887 × 10–34 J s	1
PerfectGasVolume	std. vol. ideal gas	2.241383 × 10–2 m3/mole	1
Pi	Pi, π	3.141... (mp)	3
Planck	Planck’s constant, h	6.626176 × 10–34 J s	1
ProtonMass	proton mass, Mp	1.6726485 × 10–27 kg	1
Rydberg	Rydberg’s constant, Rinfinity	1.097373177 × 107 /m	1
Speedlight	speed of light, c	2.997924580 × 108 m/s	1
StandardGravity	standard g	9.80665 m/s2 (mp)	2
StandardPressure	standard atm. pressure	1.01325 × 105 N/m2 (mp)	2
StefanBoltzman	Stefan-Boltzman, σ	5.67032 × 10–8 W/K4 /m2	1
WaterTriple	triple point of water	2.7316 × 102 K	2

Table 13-2: Supported Units
Unit	Description
time	day, hour = hr, min = minute, s = sec = second, year
frequency	Hertz = Hz
mass	AMU, g = gram, lb = pound, ounce = oz, slug
distance	Angstrom, AU, feet = foot, in = inch, m = meter = metre, micron, mile, mill, parsec, yard
area	acre
volume	l = liter = litre
force	dyne, N = Newton
energy	BTU, Erg, J = Joule
work	W = watt
pressure	ATM = atmosphere, bar
temperature	degC = Celsius, degF = Fahrenheit, degK = Kelvin
viscosity	poise, stoke
charge	Abcoulomb, C = Coulomb, statcoulomb
current	A = ampere, abampere, statampere
voltage	Abvolt, V = volt
magnetic induction	T = Tesla, Wb = Weber
other units	l, farad, mole, Gauss, Henry, Maxwell, Ohm

Prefix	Definition	Value
a	atto	10–18
f	femto	10–15
p	pico	10–12
n	nano	10–9
u	micro	10–6
m	milli	10–3
c	centi	10–2
d	deci	10–1
dk	deca	102
k	kilo	103
	myria	104
	mega	106
g	giga	109
t	tera	1012