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Other units outside the SI that are currently accepted for use with the SI by NIST are given in Table 7. These units, which are subject to future review, should be defined in relation to the SI in every document in which they are used; their continued use is not encouraged. The CIPM currently accepts the use of all of the units given in Table 7 with the SI except for the curie, roentgen, rad, and rem. Because of the continued wide use of these units in the United States, NIST still accepts their use with the SI.
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The SI derived unit of electric inductance. A changing magnetic field induces an electric current in a conductor located in the field. Although the induced voltage depends only on the rate at which the magnetic flux changes, measured in webers per second, the amount of the current depends ... on the physical properties of the coil. A coil with an inductance of one henry requires a flux of one weber for each ampere of induced current. If it is the current which changes, then the induced field will produce a potential difference within the coil: if the inductance is one henry a current change of one ampere per second produces a potential difference of one volt. The unit was named after the American physicist Joseph Henry (1797-1878).
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Similarly, a prefix on cubic meter (m3) is cubed with the unit. For example, a cubic kilometer (km3) is the volume of a cube 1 km on a side. So its volume is = 1 billion cubic meters (109 m3). Although "kilo" means thousand (103), a cubic kilometer is not the same as a thousand cubic meters. This is easier to explain with powers of ten:
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The sievert is a unit of equivalent dose or effective dose of radiation. It is named after the Swedish medical physicist Rolf Sievert (1896-1966). The equivalent dose to a tissue is found by multiplying the absorbed dose by a "quality factor", dependent upon radiation type. The effective dose to an individual can then be found by multiplying the effective dose by a factor dependent upon the part of the body irradiated.
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The candela is the basic unit of luminous intensity. It is the luminous intensity (normal to the surface) of an area equal to 1/600 000 of a square having sides of one metre of an integral cavity at the temperature of freezing platinum at a pressure of 101.325 kPa.
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A unit of energy used in nuclear physics, equal to about 4.3598 x 10-18 joule or 27.212 electron volts. The unit was named after the British physicist and mathematician Douglas R. Hartree (1897-1958).
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