Annex I Units of Measure: Code elements listed by quantities - UNECE

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Codes for Units of Measure used in International Trade Units of Measure: Code elements listed by quantities Quantity Level Cat. Use Id. Name Conversion factors to SI units (1 unit equals) Represen. Symbol Cross ref. 1 radian per second rad/s 509 wavelength 1 metre m 510 1 10 - 10 m (exactly) Å 511 wavenumber, repetency 1 reciprocal metre m-¹ 512 angular wave number, angular repetency velocity (speed) on propagation of electromagnetic waves in vacuo 1 radian per metre rad/m 513 1 metre per second m/s 514 radiant energy 1 joule J 515 radiant energy density 1 joule per cubic metre J/m ³ 516 spectral concentration of radiant energy density (in terms of wavelength), spectral radiant energy density (in terms of wave lenght) radiant power, (radiant energy flux) 1M megajoule per cubic metre MJ/m ³ 517 1 joule per metre to the fourth power J/m 4 518 1 watt W 519 radiant energy fluence 1 joule per metre squared J/m² 520 radiance exposure photon flux 1 reciprocal second s -¹ 522 photon intensity 1 reciprocal second per steradian photon luminance, photon radiance photon exitance, irradiance 1 reciprocal second per steradian metre squared 1 reciprocal second per metre squared s -¹ /sr 523 s -¹ /(sr . m ² ) 524 s -¹ /m² 525 photon exposure 1 reciprocal metre squared m -² 526 radiant energy, fluence rate radiant exitance irradiance first radiation constant 1 watt per square metre W/m ² 527 radiant intensity 1 watt per steradian W/sr 531 radiance 1 watt per steradian square metre Stefan - Boltzmann constant second radiation constant 1 watt per square metre kelvin to the fourth power W/(sr . m ²) 532 W/(m ². K 4) 533 1 metre kelvin m . K 534 emissivity 1 one 1 535 spectral emissivity 1 162 Recommendation 20
Codes for Units of Measure used in International Trade Units of Measure: Code elements listed by quantities Quantity Level Cat. Use Id. Name Conversion factors to SI units (1 unit equals) Represen. Symbol Cross ref. emissivity at a specified wavelength directional spectral emissivity luminous intensity 1 candela cd 539 luminous flux 1 lumen lm 540 quantity of light 1 lumen second lm . s 541 1S lumen hour lm . h 542 luminance 1 candela per square metre cd/m ² 543 luminous exitance 1 lumen per square metre lm/m ² 544 illuminance 1 lux lx 545 light exposure 1 lux second lx . s 546 1S lux hour 3 600 lx.s lx . h 547 1 1 luminious efficacy 1 lumen per watt lm/W 548 spectral luminous efficacy, luminous efficacy at a specified wavelength, maximum spectral luminous efficacy luminous efficiency 1 one 1 550 spectral luminous efficiency, luminous efficiency at a specified wavelength CIE colorimetric functions 1 one 1 552 coordinates trichromatic 1 one 1 553 spectral absorption factor, spectral absorptance spectral reflection factor, spectral reflectance spectral transmission factor, spectral transmittance spectral radiance factor 1 one 1 554 optical density 1 one 1 558 refractive index 1 one 1 559 linear attenuation coefficient, linear extinction coefficient linear absorption coefficient 1 reciprocal metre m -¹ 560 Recommendation 20 163
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Annex I Units of Measure: Code elements listed by quantities - UNECE

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