Download The International System of Units (SI) by Barry N. Taylor PDF

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By Barry N. Taylor

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Therefore, they are not followed by a period except at the end of a sentence, and one must neither use the plural nor mix unit symbols and unit names within one expression, since names are not mathematical entities. In forming products and quotients of unit symbols the normal rules of algebraic multiplication or division apply. Multiplication must be indicated by a space or a half-high (centered) dot (⋅), since otherwise some prefixes could be misinterpreted as a unit symbol. Division is indicated by a horizontal line, by a solidus (oblique stroke, /) or by negative exponents.

1 and Table 8, p. 35). Because SI prefix symbols can neither be attached to the symbol 1 nor to the name “one,” powers of 10 are used to express the values of particularly large or small dimensionless quantities. 51 × 1, where n is the quantity symbol for refractive index. 01. Thus, it can be used to express the values of dimensionless quantities. When it is used, a space separates the number and the symbol %. ” Phrases such as “percentage by mass,” “percentage by volume,” or “percentage by amount of substance” should not be used; the extra information on the quantity should instead be conveyed in the name and symbol for the quantity.

Using the unit radian per second for angular velocity, and hertz for frequency, also emphasizes that the numerical value of the angular velocity in radian per second is 2π times the numerical value of the corresponding frequency in hertz. In the field of ionizing radiation, the SI unit of activity is designated the becquerel rather than the reciprocal second, and the SI units of absorbed dose and dose equivalent are designated the gray and the sievert, respectively, rather than the joule per kilogram.

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