It is a pity that the definition of a kilogram has to be some huge number of wavelengths or carbon atoms or what have you. Is the idea of it being the mass of a cubic decimeter of water at the triple point too old fashioned now?
Relating the units of length and mass by means of the density of water was a beautiful plan, but now they have only some arbitrary chunk of metal or a "close enough" number of atoms of the right isotope. While i am at it ;), since a liter is only "close to" 1000 cubic centimeters, even the supposedly identical qualities of capacity and volume are not related. This is as bad as having both gallons and dry gallons! Ironically, the relationship between feet and US gallons (231 cubic inches) is simpler than the meter-liter relationship. rocky __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
