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Company Writer's Guide

[For Illustration Only] B-7

Symbols for Units in General Use (Cont’d)

Unit Symbol Notes

darcy D 1 D = 1 cP (cm/s) (cm/atm) = 0.986 923 μm

A unit of permeability of a porous medium. By

traditional definition, a permeability of one

darcy will permit a flow of 1 cm

/s of fluid of 1

cP viscosity through an area of 1 cm

under a

pressure gradient of 1 atm/cm. For nonprecision

work 1 D may be taken equal to 1 μm

and 1 mD

equal to 0.001 μm

. Deprecated

(see ANSI Z210.1-1976).

day d

deci d SI prefix for 10

-1

decibel dB

degree (plane angle) . . . °

degree (temperature):

degree Celsius

°C

SI unit of Celsius temperature. The degree

Celsius is a special name for the kelvin, for use in

expressing Celsius temperatures or temperature

intervals.

degree Fahrenheit °F

Note that the symbols for °C, °F, and °R

comprise two elements, written with no space

between the ° and the letter that follows. The

two elements that make the complete symbol are

not to be separated.

degree Kelvin See kelvin.

degree Rankine °R

deka da SI prefix for 10.

dyne dyn Deprecated (see ANSI Z210.1-1976).

electronvolt eV

erg erg Deprecated (see ANSI Z210.1-1976).

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