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

Bob kb8tq kb8tq at n1k.org
Sat Dec 9 15:13:23 EST 2017


Hi

I suspect that at the practical level, you define standard atmospheric pressure, standard 
gravity, standard magnetic field ….. and on down the list. At some point “sea level” becomes
a redundant expression.

Bob

> On Dec 9, 2017, at 2:14 PM, Mark Sims <holrum at hotmail.com> wrote:
> 
> 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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