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UN/CEFACT


United Nations Centre for Trade Facilitation and Electronic Business
 
Trade Facilitation Recommendation N° 20

 

Units of Measure: Code elements listed by quantities

 

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< < < <
Quantity
Level
Cat.
Use
Id.
Name
Convesion factors to SI units (1 unit equals)
Represen.
Symbol
Cross
ref.
Physical Chemistry and Molecular Physics
             
relative atomic mass 1   one   1 616
relative molecular mass 1   one   1 617
number of molecules or other elementary entities 1   one   1 618
amount of substance 1   mole   mol 619
  1S   kilomole kmol    620
  1S   millimole mmol    621
  1S   micromole   µmol 622
Avogadro constant 1   reciprocal mole   mol 623
molar mass 1   kilogram per mole   kg/mol 624
  1S   gram per mole   g/mol 625
molar volume 1   cubic metre per mole   m³/mol 626
  1S   cubic decimetre per mole 1 dm3/mol dm³/mol 627
  1S   cubic centimetre per mole cm³/mol    628
  1M   litre per mole 1 dm3/mol l/mol 629
molar thermodynamic energy 1   joule per mole   J/mol 630
  1S   kilojoule per mole   kJ/mol 631
chemical potential 1   joule per mole   J/mol 632
absolute activity 1   one   1 633
affinity (of a chemical reaction) 1   joule per mole   J/mol 634
standard equilibrium constant 1   one   1 635
molar heat capacity 1   joule per mole kelvin   J/(mol.K) 636
molar entropy            
molar gas constant            
volumic number of molecules (or particles), 1   reciprocal cubic metre   m-³ 639
number density of molecules (or particles)            
molecular concentration of B            
volumic mass, mass density, density 1   kilogram per cubic metre   kg/m³ 642
mass concentration of B 1   kilogram per litre   kg/l or kg/L 643
concentration of B, 1   mole per cubic metre   mol/m³ 644
amount of substance, 1   mole per litre 1 mol/dm3 mol/l 645
concentration of B 1S   mole per cubic decimetre   mol/dm³ 646
  1S   kilomole per cubic metre   kmol/m³ 647
volume fraction of B 1   one   1 648
mole fraction of B 1   one   1 649
mole ratio of solute B            
molality of solute B 1   mole per kilogram   mol/kg 651
ionic strength 1S   millimole per kilogram   mmol/kg 652
degree of dissociation 1   one   1 653
partial pressure of B
(in a gaseous mixture)
1   pascal   Pa 654
fugacity of B
(in a gaseous mixture)
           
osmotic pressure            
standard absolute activity of  B
 (in a gaseous mixture)
1   one   1 657
activity coefficient of B
(in a liquid as a solid mixture)
1   one   1 658
standard absolute activity of  B
(in a liquid or a solid mixture)
           
activity of solute B, relative activity of solute B
(especially in a dilute liquid solution)
1   one   1 660
activity coefficient of solute B
(especially in a dilute solution)
1   one   1 661
standard absolute activity of solute  B
(especially in a dilute solution)
           
activity of solvent A, relative activity of solvent A
(especially in a dilute solution)
1   one   1 663
osmotic coefficient of the solvent  A
(especially in a dilute solution)
           
standard absolute activity of solvent A
(especially in a dilute solution)
           
stoichiometric number of B 1   one   1 666
mass of molecule 1   kilogram   kg 667
  1   unified atomic mass unit 1,660 540 2 x 10-27 kg u 668
electric dipole moment of molecule 1   coulomb metre   C.m 669
electric polarizability of a molecule 1   coulomb metre squared per volt   C.m²/V 670
microcanonical partition function 1   one   1 671
canononical partition function            
grand-canonical partition function,
grand partition function
           
molecular partition function,
partition function of a molecule
           
statistical weight 1   one   1 675
Boltzmann constant 1   joule per kelvin   J/K 676
mean free path 1   metre   m 677
diffusion coefficient 1   square metre per second   m²/s 678
thermal diffusion ratio 1   one   1 679
thermal diffusion factor            
thermal diffusion coefficient 1   square metre per second   m²/s 681
proton number 1   one   1 682
elementary charge 1   coulomb    C 683
charge number of ion 1   one   1 684
Faraday constant 1   coulomb per mole   C/mol 685
electrolytic conductivity 1   siemens per metre   S/m 686
molar conductivity 1   siemens square metre per mole   S.m²/mol 687
transport number of ion B, current fraction of ion B 1   one   1 688
angle of optical rotation 1   radian   rad 689
molar optical rotatory power 1   radian meter squared per mole   rad.m²/mol 690
massic optical rotatory power,
specific optical rotatory power
1   radian metre squared per kilogram   rad. m²/kg 691

 

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