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Norm, the discussion will go on until the last country switches to SI-unit. Having had a decimal system before the switch was quite easy for us. I started as an civil engineer in the pre-SI-unit era. I'm in model railroading following American prototypes since the early 1980s. So I'm quite used to imperial measures. For industry and trade one single system might be better. But I think humans would find measures to erect new hindrances. I get along with both systems, for sure better with the decimal system. Perhaps I didn't understand RME's post correctly. So I posted some details about the meter definition and its history. I don't understand RME's statement "The fact that the 'time' involved does not fit into the groups-of-three SI framework applied to time in seconds". Therefore the list of basic SI-units.
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