Company Writer's Guide
| Unit | Symbol | Notes |
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ampere | A | SI unit of electric current. |
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ampere (turn) | A | SI unit of magnetomotive force. |
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Ah | Also A•h | |
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ampere per meter | A/m | SI unit of magnetic field strength. |
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angstrom |
| 1 = |
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atmosphere, standard | atm | 1 atm = 101 325 Pa (deprecated, see ANSI Z210.1- |
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| 1976) |
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atmosphere, technical | at | 1 at = 1 kgf/cm2 (deprecated, |
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| see ANSI |
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atomic mass unit (unified) | u | The (unified) atomic mass unit is defined as one |
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| twelfth of the mass of an atom of the 12C nuclide. |
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| Use of the old atomic mass (amu), defined by |
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| reference to oxygen, is deprecated. |
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atto | a | SI prefix for |
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attoampere | aA |
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bar | bar | 1 bar = 100 kPa. Use of the bar is strongly |
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| discouraged (see ANSI |
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| limited use in meteorology. |
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barn | b | 1 b = |
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barrel | bbl | 1 bbl = 42 galUS = 158.99 L |
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barrel per day | bbl/d | This is the standard barrel used for petroleum, |
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| etc. A different standard barrel is used for fruits, |
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| vegetables, and dry commodities. |
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baud | Bd | In telecommunications, a unit of signaling speed |
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| equal to one element per second. The signaling |
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| speed in bauds is equal to the reciprocal of the |
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| signal element length in seconds. |
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[For Illustration Only] |