Resolution-CGPM-9-7

Resolution 7 of the 9th CGPM

Writing and printing of unit symbols and of numbers

Principles

Roman (upright) type, in general lower case, is used for symbols of units; if, however, the symbols are derived from proper names, capital roman type is used. These symbols are not followed by a full stop.

In numbers, the comma (French practice) or the dot (British practice) is used only to separate the integral part of numbers from the decimal part. Numbers may be divided in groups of three in order to facilitate reading; neither dots nor commas are ever inserted in the spaces between groups.

Unit Symbol   Unit Symbol
   

·metre

m

ampere

A

·square metre

m2

volt

V

·cubic metre

m3

watt

W

·micron

µ

ohm

Ω

·litre

l

coulomb

C

·gram

g

farad

F

·tonne

t

henry

H

second

s

hertz

Hz

erg

erg

poise

P

dyne

dyn

newton

N

degree Celsius

°C

·candela

 
   

(new candela)

cd

·degree absolute

°K

lux

lx

calorie

cal

lumen

lm

bar

bar

stilb

sb

hour

h

   

Notes

  1. The symbols whose unit names are preceded by dots are those which had already been adopted by a decision of the CIPM.
  2. The symbol for the stere, the unit of volume for firewood, shall be "st" and not "s", which had been previously assigned to it by the CIPM.
  3. To indicate a temperature interval or difference, rather than a temperature, the word "degree" in full, or the abbreviation "deg" must be used.

reference The reader should note that the official version of this Resolution is the French text

NOTE

The CGPM abrogated certain decisions on units and terminology, in particular: micron, degree absolute, and the terms "degree", and "deg", 13th CGPM, 1967 (Resolutions 7 and 3), and the litre; 16th CGPM, 1979 (Resolution 6).

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