Hi,
On 12/09/2017 09:13 PM, Bob kb8tq wrote:
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.
The standard acceleration is internationally agreed at 3rd CGPM in 1901
to be 9.80665 m/s^2. So, that is "sea level". See SI brochure, I used
version 8 in english, page 143.
This is also the standard value I have in my calculators and used for
all my acceleration calculations.
In practice labs have their contributions into EAL/TAI corrected for
their deviation from "sea level" for proper frequency of TAI.
Cheers,
Magnus
Bob
On Dec 9, 2017, at 2:14 PM, Mark Sims <[email protected]> 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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