Annex I Units of Measure: Code elements listed by quantities - UNECE
Annex I Units of Measure: Code elements listed by quantities - UNECE
Annex I Units of Measure: Code elements listed by quantities - UNECE
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<strong>Code</strong>s for <strong>Units</strong> <strong>of</strong> <strong>Measure</strong> used in International Trade<br />
<strong>Units</strong> <strong>of</strong> <strong>Measure</strong>: <strong>Code</strong> <strong>elements</strong> <strong>listed</strong> <strong>by</strong> <strong>quantities</strong><br />
Quantity<br />
Level<br />
Cat.<br />
Use<br />
Id.<br />
Name<br />
Conversion factors to SI<br />
units<br />
(1 unit equals)<br />
Represen.<br />
Symbol<br />
Cross<br />
ref.<br />
reaction energy 1 joule J 757<br />
resonance energy 1 electronvolt 1,602 177 33 x 10 - 19<br />
J eV 758<br />
average energy loss per<br />
ion pair formed, (average<br />
energy loss per<br />
elementary charge <strong>of</strong> the<br />
same sign produced)<br />
2 X erg 10 - 7<br />
J (exactly) erg 759<br />
cross-section 1 square metre m ² 760<br />
total cross-section 1 barn 10 - 28<br />
m² (exactly) b 761<br />
angular cross-section 1 square metre per steradian m ²/ sr 762<br />
1 barn per sterdian b/sr 763<br />
spectral cross-section 1 square metre per joule m ² /J 764<br />
spectral angular<br />
cross-section<br />
macroscopic crosssection,<br />
volumic cross-section,<br />
volumic total crosssection,<br />
macroscopic total crosssection<br />
1 barn per electron volt 6,241 46 x 10 - 10<br />
m²/J b/eV 765<br />
2 square centimetre per erg 10³ m²/J (exactly) cm ² /erg 766<br />
1 square metre per steradian<br />
joule<br />
1 barn per steradian electron<br />
volt,<br />
2 square centimetre per<br />
steradian erg<br />
m ²/ (sr . J) 767<br />
6,241 46 x 10 - 10<br />
m²/(sr . J) b/(sr . eV) 768<br />
10³ m²/(sr . J) (exactly) cm ² /(sr . erg) 769<br />
1 reciprocal metre m -¹ 770<br />
particle fluence 1 reciprocal square metre m -² 771<br />
particle fluence rate,<br />
(partical flux density)<br />
neutron fluence rate,<br />
(neutron flux density)<br />
current density <strong>of</strong><br />
particles<br />
1 reciprocal metre squared<br />
reciprocal second<br />
m -² /s 772<br />
energy fluence 1 joule per square metre J/m ² 774<br />
energy fluence rate,<br />
(energy flux density)<br />
linear attenuation<br />
coefficient<br />
mass attenuation<br />
coefficient<br />
molar attenuation<br />
coefficient<br />
1 watt per square metre W/m ² 775<br />
2 X erg per square centimetre<br />
second<br />
10 - ³ W/m² (exactly) erg/(cm ². s) 776<br />
1 reciprocal metre m -1 777<br />
1 square metre per kilogram m ² /kg 778<br />
1 square metre per mole m ²/ mol 779<br />
Recommendation 20 171
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