Company Writer's Guide
Symbols for Units in General Use (Cont’d)
Unit | Symbol | Notes |
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darcy | D | 1 D = 1 cP (cm/s) (cm/atm) = 0.986 923 μm2 |
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| A unit of permeability of a porous medium. By |
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| traditional definition, a permeability of one |
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| darcy will permit a flow of 1 cm3/s of fluid of 1 |
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| cP viscosity through an area of 1 cm2 under a |
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| pressure gradient of 1 atm/cm. For nonprecision |
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| work 1 D may be taken equal to 1 μm2 and 1 mD |
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| equal to 0.001 μm2. Deprecated |
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| (see ANSI |
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day | d |
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deci | d | SI prefix for |
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decibel | dB |
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degree (plane angle) | . . . ° |
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degree (temperature): |
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degree Celsius | °C | SI unit of Celsius temperature. The degree |
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| Celsius is a special name for the kelvin, for use in |
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| expressing Celsius temperatures or temperature |
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| intervals. |
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degree Fahrenheit | °F | Note that the symbols for °C, °F, and °R |
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| comprise two elements, written with no space |
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| between the ° and the letter that follows. The |
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| two elements that make the complete symbol are |
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| not to be separated. |
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degree Kelvin |
| See kelvin. |
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degree Rankine | °R |
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deka | da | SI prefix for 10. |
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dyne | dyn | Deprecated (see ANSI |
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electronvolt | eV |
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erg | erg | Deprecated (see ANSI |
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[For Illustration Only] |