On 19.12.2012 16:47, Gregor Hagedorn wrote:
Daniel confirms (in separate mail) that Wikidata indeed intends to convert any derived SI units to a common formula of base units.
Example: a quantity like "1013 hektopascal", the common unit for meterological barometric pressure (this used to be millibar), would be stored and re-displayed as 1.013 10^5 kg⋅m−1⋅s−2
Converted and stored, yes, but not displayed. For display, it would be converted to a customary/convenient unit according to the user's (or client site's) locale, using a bit of heuristics to get the scale (order of magnitude) right.
Of course, in wikitext, the desired output unit can be specified.
-- daniel