The NIST version, SP330, has its own foreword. Spellings of meter, liter, deka- and metric ton are preferred to metre, litre, deca-, and tonne (is it fair to call "metric ton" a spelling difference?). These are addressed in the foreword and generally made without further comment throughout the body. Other differences are clearly explained through "Editors Notes" as footnotes or marginalia and are mostly VERY minor. The symbol "L" is preferred to "l" for the liter. Section 4.3 and Table 10 are unique to the US version and accept (but strongly discourage) continued use of the curie, roentgen, rad and rem (radiation units). Table 10 gives conversions to SI units: becquerel, coulomb per kilogram, gray and sievert
________________________________ From: Pat Naughtin <[email protected]> To: U.S. Metric Association <[email protected]> Cc: UKMA Metric Association <[email protected]> Sent: Thu, November 11, 2010 2:59:32 PM Subject: [USMA:48845] Re: The United States does not use the metric system It's interesting that the decision to use the meter and liter spelling probably then led to the need for the existence of NIST SP 330. It is also interesting to note that despite the cover of NIST SP 330, it seems to be the intention of the writers, Barry N. Taylor and Ambler Thompson that the English version of Le Système International d’ Unités (SI) and the USA English version are to be considered as two different beasts. This intention is implied by the sub-title of NIST SP 330 that reds: "United States version of the English text of the eighth edition (2006) of the International Bureau of Weights and Measures publication Le Système International d’ Unités (SI)". So let me ask: Is the BIPM SI the same as the NIST SI? >
