# Talk:MKS system of units

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## Modern definition

Does the BIPM or any other authority provide a modern definition of the mks system of units? If the mks system of units never had a governing body to rule on a standard definition then the list of mks units might depend on different conventions and different times. For example a "cycle" may or may not have been a unit in the mks system prior to its exclusion from the International System of Units. At least one journal article in a peer-reviewed journal uses the term "cycles/second". See p. 347 of "Magnetic Formulae Expressed in the M. K. S. System of Units" by A. E. Kennelly in Proceedings of the American Philosophical Society v. 76, p. 343 (1936) --John David Wright 20:10, 26 February 2007 (UTC)

If I'm not mistaken (& I wouldn't be too greatly surprised if I were), the SI is an mks system (the metre, kilogram & second are base units in the SI) and thus the BIPM does provide a modern definition. JIMp talk·cont 16:19, 27 August 2009 (UTC)

## mksc units, addition of charge to the MKS system

My old physics book (Sears and Zemansky 1964), after moving beyond Newtonian mechanics into electrostatics, introduces the mksc units [in lower case], cf page 742:

"The mksc unit of mutual inductance is 1 volt/(amp/sec). This is called 1 henry in honor of Joseph Henry".

Where the volt is defined in terms of the "potential energy per unit charge" (cf p 569). When I interrogate wikipedia "mksc" does not come up to physics articles. Anybody out there know what's going on with respect to the addition of "charge" (c) to the mks unit system? Thanks, Bill