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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.
SOLID STATE PHYSICS
lattice vector 1   metre   m 879
fundamental lattice vector            
lattice plane spacing 1   ångström 10-10 m (exactly) Å 881
Burgers vector            
Bragg angle 1   radian   rad 883
  1   degree 0,017 453 29 rad ° 884
order of reflexion 1   one   1 885
short-range order parameter 1   one   1 886
long-range order parameter            
relaxation time 1   second   s 888
carrier life time            
magnetic flux quantum 1   weber   Wb 890
particle position vector 1   metre   m 891
equilibrium position vector of ion or atom            
displacement vector of ion or atom            
Debye-Walle factor 1   one   1 894
mean free path of phonons or electrons 1   metre   m 895
London penetration depth            
coherence length            
diffusion length            
angular repetency, angular wave number 1   reciprocal metre   m 899
Fermi angular repetency, Fermi angular wavenumber 1   reciprocal ångström 1010 m- ¹ (exactly) Å 900
Debye angular repetency, Debye angular wave number 1   radian per metre   rad/m 901
angular reciprocal lattice vector fundamental reciprocal lattice vector 1   reciprocal metre   m-1 902
Debye angular frequency 1   radian per second   rad/s 903
  1   reciprocal second   s-1 904
Debye temperature 1   kelvin   K 905
Curie temperature            
Néel temperature            
Fermi temperature            
Super conductor transition temperature            
spectral concentration of vibrational modes (in terms of angular frequency) 1   second per cubic metre   s/m³ 910
  1   second per radian cubic metre   s/(rad.m3) 911
Grüneisen parameter 1   one   1 912
Madelung constant 1   one   1 913
Landau-Ginzburg number 1   one   1 914
density of states 1   reciprocal joule per cubic metre   J/m³ 915
  1   reciprocal electron volt per cubic metre 6,241 46 x 1018 J- ¹/m³ eV/m³ 916
residual resistivity 1   ohm metre   W.m 917
Lorenz coefficient 1   volt  squared per kelvin squared   V²/K² 918
Hall coefficient 1   cubic metre per coulomb   m³/C 919
thermoelectromotive force between substances a and b 1   volt   V 920
Peltier coefficient for substances a and b            
thermodynamic critical magnetic flux density 1   tesla   T 922
lower critical magnetic flux density            
upper critical magnetic flux density            
Seebeck coefficient for substances a and b 1   volt per kelvin   V/K 925
Thompson coefficient 1S   millivolt per kelvin   mV/K 926
work function 1   joule   J 928
Fermi energy 1   electronvolt 1,602 177 33 x 10-19 J eV 929
gap energy 1S   femtojoule   fJ 930
donor ionization energy 1S   attojoule   aJ 931
acceptor ionization energy            
exchange intergral            
superconductor energy gap            
electron affinity            
Richardson constant 1   ampere per square metre kelvin squared   A/(m².K²) 936
electron number density, volumic electron number 1   reciprocal cubic metre   m 937
hole number density, volumic hole number            
donor number density, volumic donor number            
intrinsic number density, volumic intrinsis number            
acceptor number density, volumic acceptor number            
effective mass 1   kilogram   kg 942
mobility ratio 1   one   1 943
Miscellaneous (to be found a suitable quantity)            
Burst index 1M   kilopascal square metres per gram   kPa.m²/g 944
Hardness index 1M   kilopascals per millimetre   kPa/mm 945
Porosity 1M   millilitres per square centimetre second   ml/(cm².s) 946
Porosity 1M   cubic feet per minute per square foot   ft³/(min/ft²) 947
Sheet density 1M   ounces per square foot per 0,01 inch   oz/(ft²/cin) 948

 

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