If you do that then you won't have one conversion, you'll have two: from old kilograms to pounds and from new kilograms to pounds. And also, whenever you see something marked, say, "100 kilograms," you won't know what kind of kilograms they're talking about. Which may not matter if you're weighing a kilogram of navy beans, but which certainly would matter when making the manifest for a satellite launch.
"But, but, that was a joke," you say. "No one could possibly be stupid enough to define two close-yet-significantly-different units of measurement which, to make it worse, share the same name."
Let me introduce you, then, to the U.S. Survey Foot, which was created by precisely the kind or making-arithmetic-easy reason that you unseriously propose. A U.S. Survey Foot is close enough to the International Foot that you couldn't possibly tell them apart just by looking at the data (like you can, for instance, between feet and meters), but it is enough different - one part in a half-million - that geodetic calculations (e.g. involving state plane coordinates, or WGS coordinates derived from GPS measurements) done using the one unit automatically generate wonderfully confusing and potentially quite costly errors when accidentally compared with the other.
Yours WDK - WKiernan@ij.net
Minnamin, Gut mag alkan, Pern dirstan.
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