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 31-1:1992, 1-3.a (remarks)] | [ISO 1000:1992, Annex A, 6.3] |
ARE | a | area | The product of length and width. 1 a = 1 dam2 = 102 m2 (exactly). |
AREA | 6 | PR | [ISO 31-1:1992, 1-5.a (remarks)] | [ISO 1000:1992, Annex A, 1-4] |
ASTRONOMICAL_UNIT | AU | length | 1 AU = 1,495 978 7 x 1011 m (approximately). | LENGTH | 7 | PR | [ISO 31-1:1992, 1-3.B.b] | |
BAR | bar | pressure | The force that is exerted per unit area. 1 bar = 105 Pa (exactly). |
PRESSURE | 8 | PR | [ISO 31-3:1992, 3-15a (remarks)] | [ISO 1000:1992, Annex A, 3-15.1] |
BARN | b | area | The product of length and width. 1 b = 100 fm2 = 10-28 m2 (exactly). |
AREA | 9 | PR | [ISO 31-10:1992, 10-3.a (remarks)] | |
CURIE | Ci | activity of a radio nuclide | The average number of spontaneous nuclear transitions from a particular energy state occurring in an amount of a radionuclide in a small time interval, divided by that interval. 1 Ci = 3.7 x 1010 Bq (exactly). |
RADIONUCLIDE- _ACTIVITY |
30 | PR | [ISO 31-9:1992, 9-33.a (remarks)] | [ISO 1000:1992, Annex A, 9-33] |
FOOT | ft | length | 1 ft = 0,304 8 m (exactly). | LENGTH | 51 | PR | [ISO 31-1:1992, 1-3.A.b] | |
GAL | Gal | acceleration | The change in velocity divided by time. 1 Gal = 0,01 m/s2 (exactly). |
ACCELERATION | 52 | PR | [ISO 31-1:1992, 1-11.B.a] | |
GEOPOTENTIAL_METRE | gpm | geopotential energy height (geopotential specific energy) | A height proportional to the potential energy of mass (geopotential) at this height relative to the geoid. The geopotential metre varies with geodetic latitude. On <EARTH> at mid-latitudes it equals 0,98 m (approximately). |
GEOPOTENTIAL- _ENERGY_LENGTH |
53 | IR | [WMO182, "geopotential altitude"] | |
GON | gon | plane angle | The angle between two half-lines terminating at the same point is defined as the ratio of the length of the included arc of the circle (with its centre at that point) to the radius of that circle. 1 gon = π / 200 rad = 0,015 707 96 rad (exactly). |
PLANE_ANGLE | 54 | PR | [ISO 31-1:1992, 1-1.B.a] | [ISO 1000:1992, Annex A, 1-1] |
HECTARE | ha | area | The product of length and width. 1 ha = 1 hm2 = 104 m2 (exactly). |
AREA | 62 | PR | [ISO 31-1:1992, 1-5.a (remarks)] | |
KILOPOUND | kp | mass | 1 kip = 453,592 37 kg (exactly). | MASS | 126 | PR | [ISO 31-3:1992, 3-1.B.a] | [ISO 31-0:1992, 2.3.2.3] |
KNOT | kn | velocity | The distance divided by time. 1 kn = 1 nautical mile per hour = 1,852 km/h = 0,514 444 m/s (exactly). |
SPEED | 128 | PR | [ISO 31-1:1992, 1-10.b (remarks)] | [ISO 1000:1992, Annex A, 1-10] |
LIGHT_YEAR | l.y. | length | The distance travelled in 1 year by electromagnetic waves in free space. 1 l.y. = 9,460 730 x 1015 m (exactly). |
LENGTH | 129 | PR | [ISO 31-1:1992, 1-3.B.a] | |
LONG_TON | ton (long) | mass | 1 long ton (US) = 1 ton (UK) = 1 016,047 kg (exactly). | MASS | 133 | PR | [ISO 31-3:1992, 3-1.B.e] | |
MILE | mile | length | 1 mile = 1 609,344 m (exactly). | LENGTH | 148 | PR | [ISO 31-1:1992, 1-3.A.d] | |
MILE_PER_HOUR | mile/h | velocity | The distance divided by time. 1 mile/h = 0,447 04 m/s (exactly). |
SPEED | 149 | PR | [ISO 31-1:1992, 1-10.A.b] | |
NAUTICAL_MILE | none | length | 1 nautical mile = 1 852 m (exactly). | LENGTH | 158 | PR | [ISO 31-1:1992, 1-3.a (remarks)] | |
PARSEC | pc | length | The distance at which 1 astronomical unit subtends an angle of 1 second of arc. 1 pc = 206 264,8 AU = 30,856 78 x 1015 m (exactly). |
LENGTH | 172 | PR | [ISO 31-1:1992, 1-3.B.c] | |
PERCENT | % | special (pure number) | 1% = 0,01 x 1 (often omitted). | PURE_NUMBER | 179 | PR | [ISO 31-0:1992, 2.3.3] | |
PPB_MASS_FRACTION | none | mass fraction (of B) | The mass of B divided by the mass of the mixture. 1 x 10-9 kg/kg (exactly). |
MASS_FRACTION | 181 | PR | [ISO 31-8:1992, 8-12.a] | [ISO 31-0:1992, 2.3.3] |
PPM_MASS_FRACTION | none | mass fraction (of B) | The mass of B divided by the mass of the mixture. 1 x 10-6 kg/kg (exactly). |
MASS_FRACTION | 182 | PR | [ISO 31-8:1992, 8-12.a] | [ISO 31-0:1992, 2.3.3] |
PPT_MASS_FRACTION | none | mass fraction (of B) | The mass of B divided by the mass of the mixture. 1 x 10-12 kg/kg (exactly). |
MASS_FRACTION | 183 | PR | [ISO 31-8:1992, 8-12.a] | [ISO 31-0:1992, 2.3.3] |
PPTH_MASS_FRACTION | none | mass fraction (of B) | The mass of B divided by the mass of the mixture. 1 x 10-3 kg/kg (exactly). |
MASS_FRACTION | 184 | PR | [ISO 31-8:1992, 8-12.a] | [ISO 31-0:1992, 2.3.3] |
RAD | rd | absorbed dose of ionizing radiation | For any ionizing radiation, the energy imparted to an element of irradiated matter divided by the mass of this element. 1 rad = 1 cGy = 10-2 Gy (exactly). |
ABSORBED_DOSE | 185 | PR | [ISO 31-10:1992, 10-51.a (remarks)] | [ISO 1000:1992, Annex A, 10-51.2] |
REM | rem | dose equivalent of ionizing radiation | The product of D, Q and N, at the point of interest in tissue, where D is the absorbed dose, Q is the quality factor and N is the product of any other modifying factors. 1 rem = 1 cSv = 10-2 Sv (exactly). |
DOSE_EQUIVALENT | 190 | PR | [ISO 31-10:1992, 10-52.a (remarks)] | [ISO 1000:1992, Annex A, 10-52] |
ROENTGEN | R | exposure of ionizing radiation | The total electric charge of the ions of the same sign produced when all the electrons (negative and positive) liberated by photons in an element of air are stopped in air, divided by the mass of that element. 1 R = 2,58 x 104 C/kg (exactly). |
EXPOSURE | 191 | PR | [ISO 31-10:1992, 10-58.a (remarks)] | [ISO 1000:1992, Annex A, 10-58] |
TON | ton | mass | 1 ton (US) = 907,184 7 kg (exactly). | MASS | 217 | PR | [ISO 31-3:1992, 3-1.B.e] | |
YEAR | a | time (annum) | The time that elapses between two successive passages of the <SUN> through the vernal equinox. 1 year = 365,242 20 d = 31 556 926 s (approximately). |
TIME | 245 | PR | [ISO 31-1:1992, 1-7.B.a] |
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