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However, the number 1 generally does not appear in the expression for the value of a quantity of dimension one.For example, the value of the refractive index of a given medium is expressed as = 1.51 × 1 = 1.51.
The correct statement is, for example, "* is the numerical value of the time of travel t of the particle when t is expressed in seconds." Clearly, as is done here, it is important to use different symbols for quantities and their numerical values to avoid confusion.
It is the strong recommendation of this Guide that because of their universality, quantity equations should be used in preference to numerical-value equations.
This will allow the paper to be understood by as broad an audience as possible, including readers with limited knowledge of English.
Thus, to promote the comprehension of quantitative information in general and its broad understandability in particular, values of quantities should be expressed in acceptable units using takes the position that values of quantities must be written so that it is completely clear to which unit symbols the numerical values of the quantities belong.
4.2.1).7.10.1 Decimal multiples and submultiples of the unit one Because SI prefix symbols cannot be attached to the unit one (see Sec.
6.2.6), powers of 10 are used to express decimal multiples and submultiples of the unit one.
On the other hand, certain quantities of dimension one have units with special names and symbols which can be used or not depending on the circumstances.
Plane angle and solid angle, for which the SI units are the radian (rad) and steradian (sr), respectively, are examples of such quantities (see Sec.
Also to avoid possible confusion, this strongly recommends that the word "to" be used to indicate a range of values for a quantity instead of a range dash (that is, a long hyphen) because the dash could be misinterpreted as a minus sign.
(The first of these recommendations once again recognizes that unit symbols are not like ordinary words or abbreviations but are mathematical entities—see Sec.