## Espais davant dels símbols

#### Estil i convencions

A la UB, per als textos científics i tècnics, se segueix el que diu el document del NIST titulat Guide for the Use of the International System of Units, on es pot trobar l’apartat Rules and Style Conventions for Expressing Values of Quantities, on podem llegir el següent:

7.2 Space between numerical value and unit symbol

In the expression for the value of a quantity, the unit symbol is placed after the numerical value and a space is left between the numerical value and the unit symbol.

The only exceptions to this rule are for the unit symbols for degree, minute, and second for plane angle: °, ′, and ″, respectively (see Table 6), in which case no space is left between the numerical value and the unit symbol.

 Example: α = 30°22′8″ Note: α is a quantity symbol for plane angle.

This rule means that:

(a) The symbol °C for the degree Celsius is preceded by a space when one expresses the values of Celsius temperatures.

Example: t = 30.2 °C but not: t = 30.2°C or t = 30.2° C

(b) Even when the value of a quantity is used in an adjectival sense, a space is left between the numerical value and the unit symbol. (This rule recognizes that unit symbols are not like ordinary words or abbreviations but are mathematical entities, and that the value of a quantity should be expressed in a way that is as independent of language as possible - see Sec. 7.6 and Sec. 7.10.3.)

 Examples: a 1 m end gauge but not: a 1-m end gauge a 10 kΩ resistor but not: a 10-kΩ resistor

However, if there is any ambiguity, the words should be rearranged accordingly. For example, the statement "the samples were placed in 22 mL vials" should be replaced with the statement "the samples were placed in vials of volume 22 mL."

Universitat de Barcelona. Serveis Lingüístics
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