Uncertain science

I was amused to see this report last month, since I remember studying SI units in physics at school, and it already seemed an anachronism that weight was defined in terms of a lump of metal stored securely in Paris, while other measures are defined in more contemporary and, as far as one can tell, technical matters.  It also seems like an inconsistency given that the metric system does depend on a simple relationship between the measures of distance and of weight, in that a litre (1000 cubic centimetres) of water weighs a kilogramme.

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