Systeme International d’Unites. See

Systeme International d Unites /see-stem an-tair-nas-yo-nal doo-nee-tay/ See SI units. 

SI Abbreviation for the worldwide standard prepared by the International System of Units. SI is from the French name Le Systeme International d Unites. This standard gives guidance for application of the modernized metric system developed and maintained by the Group Conference on Weights and Measures (CGPM for the official French name Conference Generale des Poids et Mesures). The SI abbreviations were adopted by the eleventh CGPM in 1960. See Appendix B, Conversion Tables decimal number system measurement meter number marker. 

SI = Systeme International d Unites = the world-wide system of units (except in the United States), an outgrowth of the metric system. For conversion factors between US and SI units, see pp. 245-252 of reference 51 and pp. 317-127 of... 

SI units Syst me International d Unit s the international system of units now recommended for all scientific purposes. A coherent and rationalized system of units derived from the m.k.s. units, SI units have now replaced c.g.s. units and Imperial units. The system has seven base units and two dimensionless (formerly called supplementary) units (see Appendix), all other units being derived from these nine units. There are 18 derived units with special names. Each unit has an agreed symbol (a capital letter or an initial capital letter if it is named after a scientist, otherwise the symbol consists of one or two lower-case letters). Decimal multiples of the units are indicated by a set of prefixes whenever possible a prefix representing 10 raised to a power that is a multiple of three should be used. 

The International System of Units (SI) is the modem metric system of measurement. The abbreviation SI is derived from the French Le Systeme International d UniUs. The ll" General Conference on Weights and Measures (CGPM, Confirmee Ginirale des Poids et Mesures) estabhshed the system in 1960. The seven basic units in the SI system are shown in Table 1.2, the recommended prefixes in Table 1.3 and derived units of general character are shown in Table 1.4. Some constants of importance for this book are collected in Table 1.5. These tables are collected at the end of this chapter (see pp. 14ff.). 

The International System of Units (abbreviated SI from the French Sysieme international d unites) developed in 1960 is the modern form of the metric system. This system is nowadays used in many countries both in everyday life and in science. Unfortunately, the popular use of SI units is still limited in important countries like the USA and the UK, although this may lead to mathematical mismatches with disastrous consequences (see Section Critical units at the end of this chapter). 

The first, permanent-dipole term is important only at zero frequency in the summation over imaginary sampling frequencies f . The relaxation time r is big enough that for f =i the permanent-dipole term in a is effectively zero this term counts only at zero frequency. In both mks (SI or Systeme International) and cgs ("Gaussian") units, the dipole moment //.dipole = qd for charges q separated by distance d. [See table S.8 and Eq. (L2.171) in Level 2.]... 

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