Physical Structure

Return the value of various mathematical and physical constants.

For a list of all members of this type, see Physical Members.

System.Object
System.ValueType
Imsl.Math.Physical

public struct Physical

Thread Safety

Public static (Shared in Visual Basic) members of this type are safe for multithreaded operations. Instance members are not guaranteed to be thread-safe.

Remarks

The case of the String specifying the name of the physical constant does not matter. The names 'PI', 'Pi', 'pI' and 'pi' are equivalent.

The units of the physical constants are in SI units, (meter-kilogram-second).

The names allowed are as follows:

Name
AMU
ATM
AU
Avogadro
Boltzman
C
Catalan
E
ElectronCharge
ElectronMass
ElectronVolt
Euler
Faraday
FineStructure
Gamma
Gas
Gravity
Hbar
PerfectGasVolume
Pi
Planck
ProtonMass
Rydberg
SpeedLight
StandardGravity
StandardPressure
StefanBoltzmann
WaterTriple

class="dtTABLE"> Description ValueReference Atomic mass unit 1.6605402E-27 kg [1] Standard atm pressure 1.01325E+5 $\rm {N / m^2}$ E[2] Astronomical unit 1.496E+11 m [ ] Avogadro's number 6.0221367E+23 1/mole [1] Boltzman's constant 1.380658E-23 J/K [1] Speed of light 2.997924580E+8 m/s E[1] Catalan's constant 0.915965... E[3] Base of natural logs 2.718... E[3] Electron change 1.60217733E-19 C [1] Electron mass 9.1093897E-31 kg [1] Electron volt 1.60217733E-19 J [1] Euler's constant gamma 0.577... E[3] Faraday constant 9.6485309E+4 C/mole [1] Fine structure 7.29735308E-3 [1] Euler's constant 0.577... E[3] Gas constant 8.314510 J/mole/K [1] Gravitational constant 6.67259E-11 $\rm {Nm^2/{\rm {kg}}^2}$ [1] Planck constant / 2 pi 1.05457266E-34 J*s [1] Std vol ideal gas 2.241383E-2 $\rm {m^3/ {\rm {mole}}}$ [*] Pi 3.141... E[3] Planck's constant h 6.6260755E-34 J*s [1] Proton mass 1.6726231E-27 kg [1] Rydberg's constant 1.0973731534E+7 /m [1] Speed of light 2.997924580E+8 m/s E[1] Standard g 9.80665 $\rm {m/s^2}$ E[2] Standard atm pressure 1.01325E+5 $\rm {N/m^2}$ E[2] Stefan-Boltzman 5.67051E-8 $\rm {W/K^4/m^2}$ [1] Triple point of water 2.7316E+2 K E[2]

The reference for constants are indicated by the code in the [] comment above.

[1]	Cohen and Taylor (1986)
[2]	Liepman (1964)
[3]	Precomputed mathematical constants

The constants marked with an E before the [] are exact (to machine precision).

Units strings have the form U1*U2*...*Um/V1/.../Vn, where Ui and Vi are the names of basic units or are the names of basic units raised to a power. Examples are, 'METER*KILOGRAM/SECOND', 'M*KG/S', 'METER', or ' $\rm {M/KG^2}$ '. These strings are case insensitive.

The basic unit names allowed are as follows.

Units of time

day, hour = hr, min = minute, s = sec = second, year

Units of frequency

Hertz = Hz

Units of mass

AMU, g = gram, lb = pound, ounce = oz, slug

Units of distance

Angstrom, AU, ft = feet = foot, in = inch, m = meter = metre, micron, mile, mill, parsec, yard

Units of area

acre

Units of volume

l = liter = litre

Units of force

dyne, N = Newton, poundal

Units of energy

BTU(thermochemical), Erg, J = Joule

Units of work

W = watt

Units of pressure

ATM = atomosphere, bar, Pascal

Units of temperature

degC = Celsius, degF = Fahrenheit, degK = Kelvin

Units of viscosity

poise, stoke

Units of charge

Abcoulomb, C = Coulomb, statcoulomb

Units of current

A = ampere, abampere, statampere

Units of voltage

Abvolt, V = volt

Units of magnetic induction

T = Tesla, Wb = Weber

Other units

1, farad, mole, Gauss, Henry, Maxwell, Ohm

The following metric prefixes may be used with the above units. Note that the one or two letter prefixes may only be used with one letter unit abbreviations.

A = atto = 1.E-18

F = femto = 1.E-15

P = pico = 1.E-12

N = nano = 1.E-9

U = micro = 1.E-6

M = milli = 1.E-3

C = centi = 1.E-2

D = deci = 1.E-1

DK = deca = 1.E+1

K = kilo = 1.E+3

myria = 1.E+4 (no single letter prefix; M means milli)

mega = 1.E+6 (no single letter prefix; M means milli)

G = giga = 1.E+9

T = tera = 1.E+12

Requirements

Namespace: Imsl.Math

Assembly: ImslCS (in ImslCS.dll)

Physical Structure

Thread Safety

Remarks

Requirements

See Also