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Extra resources for The International System of Units (SI)

Sample text

However the gon is rarely used. e. seconds of plane angle), denoted by the symbol as or by the symbol ″, milliarcseconds, microarcseconds, and picoarcseconds, denoted by the symbols mas, μas, and pas, respectively, where arcsecond is an alternative name for second of plane angle. (e) The unit hectare, and its symbol ha, were adopted by the CIPM in 1879 (PV, 1879, 41). The hectare is used to express land area. (f) The liter, and the symbol lower-case l, were adopted by the CIPM in 1879 (PV, 1879, 41).

U. of time a derived unit, equal to the combination of units ħ/Eh. Note that a0 = α/(4πR∞), where α is the fine-structure constant and R∞ is the Rydberg constant; and Eh = e2/(4πε0a0) = 2R∞hc0 = α2mec02, where ε0 is the electric constant and has an exact value in the SI. For information, these ten natural and atomic units and their values in SI units are also listed in Table 7. Because the quantity systems on which these units are based differ so fundamentally from that on which the SI is based, they are not generally used with the SI, and the CIPM has not formally accepted them for use with the International System.

It also contains the hectare, the liter, and the metric ton (or tonne), which are all in common everyday use throughout the world, and which differ from the corresponding coherent SI unit by an integer power of ten. The SI prefixes are used with several of these units, but not with the units of time. Table 6. Non-SI units accepted for use with the International System of Units Quantity Name of unit Symbol for unit Value in SI units time minute hour (a) day degree (b, c) minute second (d) hectare (e) liter (f) metric ton (g) min h d 1 min = 60 s 1 h = 60 min = 3600 s 1 d = 24 h = 86 400 s 1o = (π/180) rad 1′ = (1/60)o = (π/ 10 800) rad 1″ = (1/60)′ = (π/ 648 000) rad 1 ha = 1 hm2 = 104 m2 1 L = 1 dm3 = 103 cm3 = 10−3 m3 1 t = 103 kg plane angle area volume mass o ′ ″ ha L t (a) The symbol for this unit is included in Resolution 7 of the 9th CGPM (1948; CR, 70).

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