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Walker group units of measures

Introduction

SI units

Basic interactions

Dimensions and units

Numeric values of the fundamental constants

Energy Units

Magnetic resonance in SI units

 

Energy Units

Energy is the most important quantity in physics, chemistry and technology. A lot of various energy units were traditionally used. It is still necessary make conversion between different units.

 Unit

 Comment

 Unit

  1 J     6.24150974 e-18  eV
  1 J     h 1.50919050 e+33
  1 J     kB 7.242964 e+22 K 
  1 J     2.29371276 e+17 Hartree
  1 J     h c 5.03411762 e+24 m -1  
  1 J     0.2390057361 cal
  1 eV   e  V   1.602176462 e-19 J
  1 K kB     1.3806503 e-23 J  
  1 K kB     0.6950387 cm -1 c h
  1 MHz h     6.62606876 e-28 J
  1 MHz h     3.335640952 e-5 cm -1 c h
  1 m -1 c h     1.98644544 e-25 J
  1 cm -1 c h     1.98644544 e-23 J
  1 cm -1 c h     29979.2458 MHz h
  1 erg     10-7 J
  1 cal   Thermochemical calorie    4.184 J (exact
  1 cal  The international steam
tablecalorie or IT calorie 
  4.1868 J (exact)
 1 Hartree      4.35974381 e-18 J
 = 27.2113834 eV
 = 6579683899.9 MHz h
 = 219474.63067 cm -1 c h
  NA eV     23.06037 kcal mol -1
  NA J    1.439325215 e+20 kcal mol -1 
  NA Hartree       2.625501e+06 J mol -1
  = 627.5 kcal mol -1
  NA K kB     8.314511 J mol –1
  1 Wh     3600 J

This table give the correct way of conversion e.g. between cm-1 and MHz.

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