Gene Mechtly wrote to Pat Naughtin, quoted in USMA 23986:
Ton = 1 000 kg is a well established definition of ton in most countries (spelling variations aside), and is more explicitly related> to the SI base unit of mass, kilogram, than is megagram.> The Mg is unnecessary and is more of a deviation from coherent SI.
The Mg (megagram) is decimal multiple of the SI base unit kilogram. The tonne or metric ton, is the same mass, but is considered as a "non-SI unit accepted for use with the International System".
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Joseph B. Reid
17 Glebe Road West
Toronto M5P 1C8 Telephone 416-486-6071
