| Label | Symbol | Quantity | Concept definition | EQ label | Code | Reference type | Reference | Supplemental references |
|---|---|---|---|---|---|---|---|---|
| ANGSTROM | Å | length | ångström; 1 Å = 10-10 m = 10-1 nm = 10-4 μm (exactly). | LENGTH | 5 | PR | ISO 80000-3:2006, item 3-1.a (Conversion factors and remarks) and item 3-1.1 | ISO 1000:1992, Annex A, 6.3 |
| ARE | a | area | The double integral over x and y, where x and y are cartesian coordinates ISO 80000-3:2006, item 3-1.10. 1 a = 1 dam2 = 102 m2 (exactly). |
AREA | 6 | PR | ISO 80000-3:2006, item 3-3.a (Conversion factors and remarks) | ISO 1000:1992, Annex A, 1-4 |
| BAR | bar | pressure | dF/dA, where dF is the force ISO 80000-4:2006, item 4-9.1 component perpendicular to the surface element of area dA ISO 80000-3:2006, item 3-3. 1 bar = 105 Pa (exactly). |
PRESSURE | 8 | PR | ISO 80000-4:2006, item 4-15.a (Conversion factors and remarks) and item 4-15.1 | ISO 1000:1992, Annex A, 3-15.1 |
| BARN | b | cross-section | For a specified target particle and for a specified reaction or process produced by incident charged or uncharged particles of specified type and energy, the mean number of such reactions or processes divided by the incident-particle fluence ISO 80000-10:2009, item 10-44. 1 b = 100 fm2 = 10-28 m2 (exactly). |
AREA | 9 | PR | ISO 80000-10:2009, item 10-39.a (Conversion factors and remarks) | |
| CURIE | Ci | activity (of a radionuclide) | The variation dN of spontaneous number of nuclei N in a particular energy state, in a sample of a radionuclide, due to spontaneous nuclear transitions from this state during an infinitesimal time interval, divided by its duration dt ISO 80000-3:2006, item 3-7. This is equal to -dN/dt. 1 Ci = 3.7 x 1010 Bq (exactly). |
RADIONUCLIDE- _ACTIVITY |
30 | PR | ISO 80000-10:2009, item 10-29.a (Conversion factors and remarks) | ISO 1000:1992, Annex A, 9-33 |
| HECTARE | ha | area | The double integral over x and y, where x and y are cartesian coordinates ISO 80000-3:2006, item 3-1.10. 1 ha = 1 hm2 = 104 m2 (exactly). |
AREA | 62 | PR | ISO 80000-3:2006, item 3-3.a (Conversion factors and remarks) | |
| KNOT | kn | velocity | dr/dt, where r is position vector ISO 80000-3:2006, item 3-1.11 and t is time ISO 80000-3:2006, item 3-7. 1 kn = 1 nautical mile per hour = 1,852 km/h = 0,514 444 m/s (exactly). |
SPEED | 128 | PR | ISO 80000-3:2006, item 3-8.b (Conversion factors and remarks) | ISO 1000:1992, Annex A, 1-10 |
| NAUTICAL_MILE | none | length | 1 nautical mile = 1 852 m (exactly). | LENGTH | 158 | PR | ISO 80000-3:2006, item 3-1.a (Conversion factors and remarks) and item 3-1.1 | |
| RAD | rd | absorbed dose (of ionizing radiation) | For any ionizing radiation, dε/dm, where dε is the mean energy imparted ISO 80000-10:2009, item 10-83.2 by ionizing radiation to an element of irradiated matter with the mass dm ISO 80000-4:2006, item 4-1. 1 rad = 1 cGy = 10-2 Gy (exactly). |
ABSORBED_DOSE | 185 | PR | ISO 80000-10:2009, item 10-84.a (Conversion factors and remarks) and item 10-84.1 | ISO 1000:1992, Annex A, 10-51.2 |
| REM | rem | dose equivalent (of ionizing radiation) | At the point of interest in tissue, D Q where D is the absorbed dose ISO 80000-10:2009, item 10-84.1 and Q is the quality factor ISO 80000-10:2009, item 10-85 at that point. 1 rem = 1 cSv = 10-2 Sv (exactly). |
DOSE_EQUIVALENT | 190 | PR | ISO 80000-10:2009, item 10-86.a (Conversion factors and remarks) | ISO 1000:1992, Annex A, 10-52 |
| ROENTGEN | R | exposure | For X- or gamma radiation, dQ/dm, where dQ is the absolute value of the mean total electric charge of the ions of the same sign produced in dry air when all the electrons and positrons liberated or created by photons in an element of air are completely stopped in air, and dm is the mass ISO 80000-4:2006, item 4-1 of that element. 1 R = 2,58 x 104 C/kg (exactly). |
EXPOSURE | 191 | PR | ISO 80000-10:2009, item 10-92.a (Conversion factors and remarks) | ISO 1000:1992, Annex A, 10-58 |
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