| Re: Physical constants in IDL with !CONST [message #82648 is a reply to message #82525] |
Mon, 24 December 2012 01:37  |
Mats Löfdahl
Messages: 263
Registered: January 2012
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Senior Member |
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Den tisdagen den 18:e december 2012 kl. 23:34:53 UTC+1 skrev Chris Torrence:
> Hi all,
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> I'm adding a new system variable to IDL, called !CONST. So far, it's an IDL structure containing the following physical constants, in MKS units. All of these values (except for !const.pi, .e, .phi, and .R_earth) are taken from the "2010 CODATA Recommended Values," from NIST.
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> Name Description Value
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> alpha Fine structure constant 7.2973525698 x 10-3
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> c Speed of light in a vacuum 299792458 m/s
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> e Euler's number 2.7182818284590452
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> ev elementary charge e, 1 electron volt 1.602176565 x 10-19 C
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> eps0 electric vacuum permittivity 8.854187817 x 10-12 F/m
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> F Faraday constant NAe 96485.3365 C/mol
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> G Gravitation constant 6.67384 x 10-11 m3/kg/s2
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> gn Earth standard gravity 9.80665 m/s2
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> h Planck constant 6.62606957 x 10-34 J s
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> hbar h/(2pi) 1.054571726 x 10-34 J s
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> k Boltzmann constant R/NA 1.3806488 x 10-23 J/K
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> me electron mass 9.10938291 x 10-31 kg
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> mn neutron mass 1.674927351 x 10-27 kg
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> mp proton mass 1.672621777 x 10-27 kg
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> mu0 magnetic vacuum permeability 12.566370614 x 10-7 N/A2
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> Na Avogadro constant NA 6.02214129e23 mol-1
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> phi golden ratio 1.6180339887498948
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> pi Pi 3.1415926535897932
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> R molar gas constant 8.3144621 J/mol/K
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> R_earth Earth radius (spherical) 6370997.0 m
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> re classical electron radius 2.8179403267 x 10-15 m
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> rydberg Rydberg constant Rinf 10973731.568539 m-1
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> sigma Stefan-Boltzmann constant 5.670373 x 10-8 W/m2/K4
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> u unified atomic mass unit 1.660538921 x 10-27 kg
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> Here's my question: What am I missing? Are there any physical constants that most people would find useful for their day-to-day work. The key is "most" people - nothing too esoteric, or limited to a single scientific discipline, etc.
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> Thanks!
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> -Chris
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> ExelisVis
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> p.s. please limit your comments to !CONST. Our new widget system team is currently hard at work in a secret underground bunker, and cannot be disturbed.
I suggest !const.xmase=1224 and !const.xmasd=1225.
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