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Watt is it about units? ;-)"number of photons per second required to give an output of one watt per second "

(...snip...)I think the air conditioning folks in the US still use BTUs. They also rate AC units in "tons". It took me a while to figure out what on earth they were on about.

1 ton = 1019 kgspeed of light in vacuum = 2.998E8 m/sE=mc^{2} = 9.0E19 J No wonder the electricity grid struggles on hot days![]

That may well take over from the barn yard atmosphere as my favourite "ridiculous unit".

There is actually a perfectly convenient and respectable SI alternative to millibarn.1 barn = 1.E-28 m^{2}, therefore 1 millibarn = 1.E-31 m^{2}1 fm = 1.E-15 m, therefore 1 fm^{2} = 1.E-30 m^{2} = 10 millibarn

Quote from: damocles on 09/12/2011 20:30:31There is actually a perfectly convenient and respectable SI alternative to millibarn.1 barn = 1.E-28 m^{2}, therefore 1 millibarn = 1.E-31 m^{2}1 fm = 1.E-15 m, therefore 1 fm^{2} = 1.E-30 m^{2} = 10 millibarnYes, but how many sheepies would that hold?