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 />
characteristic impedence<br />
<strong>of</strong> a medium<br />
surface density <strong>of</strong><br />
mechanical impedance<br />
1S picowatt per square metre pW/m ² 593<br />
2 X erg per second square<br />
centimetre<br />
10 -3 W/m² (exactly) erg/(s . m ² ) 594<br />
1 pascal second per metre Pa . s/m 595<br />
2 X dyn second per cubic<br />
centimetre<br />
acoustic impedance 1 pascal second per cubic<br />
metre<br />
2 X dyne second per centimetre<br />
to the fifth<br />
10 Pa . s/m (exactly) dyn . s/cm ³ 596<br />
Pa . s/m ³ 597<br />
10 5 Pa . s/m³ (exactly) dyn . s/cm 5 598<br />
mechanical impedence 1 newton second per metre N . s/m 599<br />
sound pressure level<br />
sound power level<br />
2 X dyne second per centimetre 10 - ³ N . s/m dyn . s/cm 600<br />
1 decibel dB 601<br />
damping coefficient 1 reciprocal second s-¹ 602<br />
time constant,<br />
relaxation time<br />
neper per second Np/s 603<br />
1 second s 604<br />
logarithmic decrement 1 neper Np 605<br />
attenuation coefficient<br />
phase coefficient<br />
propogation coefficient<br />
dissipation factor,<br />
dissipance<br />
reflection factor,<br />
reflectance<br />
transmission factor,<br />
transmittance<br />
absorption factor,<br />
absorbance<br />
1 reciprocal metre m-¹ 606<br />
1 one 1 607<br />
sound reduction index 1 decibel dB 611<br />
equivalent absorption<br />
area <strong>of</strong> a surface or<br />
object<br />
1 square metre m ² 612<br />
reverberation time 1 second s 613<br />
loudness level 1 phon 614<br />
loudness 1 sone 615<br />
1<br />
1<br />
1<br />
Physical Chemistry and<br />
Molecular Physics<br />
relative atomic mass 1 one 1 616<br />
relative molecular mass 1 one 1 617<br />
number <strong>of</strong> molecules or<br />
other elementary entities<br />
1 one 1 618<br />
Recommendation 20 165
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