Global Warming Measurements Don't Account For 'Missing Heat'

You said downthread:

Oh yes, I believe in gravity. Have you seen the recent on the recalibration of the kilo? It seems that the mass of most substances fluctuates a little. Science does not yet understand why. (Nuclear decay occurs even in elements we describe as "stable" relative to those we call "radioactive" but I admit I don't have a source handy that confirms that the lost mass is exactly equivalent to expected nuclear decay.) The existing examples that serve as standards for the kilo are no longer acceptable for science. New standards made of new substances are being developed.
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That's a very good context to continue the analogy. Thank you for that.

http://www.sciencedaily.com/releases/2007/09/070921110735.htm
Official Kilogram Losing Mass: Scientists Propose Redefining It As A Precise Number Of Carbon Atoms
ScienceDaily (Sep. 21, 2007) — How much is a kilogram?
It turns out that nobody can say for sure, at least not in a way that won't change ever so slightly over time. The official kilogram -- a cylinder cast 118 years ago from platinum and iridium and known as the International Prototype Kilogram or "Le Gran K" -- has been losing mass, about 50 micrograms at last check. The change is occurring despite careful storage at a facility near Paris.
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50 micrograms = 0.000050g
1g = (1/1000) 1kg
so the error is
0.000050 / 1000 = 0.000000050 = 0.0000050% uncertainty
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