xlii UNITS. 



4. The C. G. S. System of Units. 



The C. G. S. system of units is a metric system in which the fundamental 

 units are the centimetre, the gramme, and the mean solar second. It is the sys- 

 tem now generally used for the expression of physical quantities. 



The most important of the derived units in the C. G. S. system, their equiva- 

 lents in terms of ordinary units, and their dimensions in terms of the fundamen- 

 tal units of length, mass, and time, are given in the Appendix to this v^olume. 



For an elaborate consideration of the subject of units and their interrelations 

 the reader may be referred to " Units and Physical Constants," by J. D. Everett, 

 London, Macmillan & Co., i2mo, 4th ed., 1891. 



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