Pat Naughtin wrote: >>I presume that you could call a square kilometre >>a hectohectare, and a square metre 0.1 millihectares. > >I am uncomfortable with this.
I am also uncomfortable with it. I was being provocative. It is not good to have a special unit name in the middle of another scale. It is not good that the special name is not scaleable. Perhaps that is why the BIPM says hectare is not encouraged.
