[time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

[Mark Sims]

In the standards definitions that include "at sea level", the question these 
days is "which sea level?".  As ocean temperature changes sea level will change 
(except maybe in Washington DC).  Will the standards be amended to include 
something like "at sea level in 1990" or will the value being defined drift 
around with the changing sea level?
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