| slovo | definícia |
platinum-iridium
(foldoc) | platinum-iridium
A standard, against which all others of the same
category are measured. Usage: silly.
The notion is that one of whatever it is has actually been
cast in platinum-iridium alloy and placed in the vault beside
the Standard Kilogram at the International Bureau of Weights
and Measures near Paris, as the bar defining the standard
metre once was.
"This garbage collection algorithm has been tested against
the platinum-iridium cons cell in Paris."
Compare golden.
[Jargon File]
(1997-02-20)
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platinum-iridium
(jargon) | platinum-iridium
adj.
Standard, against which all others of the same category are measured.
Usage: silly. The notion is that one of whatever it is has actually been
cast in platinum-iridium alloy and placed in the vault beside the Standard
Kilogram at the International Bureau of Weights and Measures near Paris.
(From 1889 to 1960, the meter was defined to be the distance between two
scratches in a platinum-iridium bar kept in that same vault — this replaced
an earlier definition as 10^-7 times the distance between the North Pole
and the Equator along a meridian through Paris; unfortunately, this had
been based on an inexact value of the circumference of the Earth. From 1960
to 1984 it was defined to be 1650763.73 wavelengths of the orange-red line
of krypton-86 propagating in a vacuum. It is now defined as the length of
the path traveled by light in a vacuum in the time interval of 1/
299,792,458 of a second. The kilogram is now the only unit of measure
officially defined in terms of a unique artifact. But this will have to
change; in 2003 it was revealed that the reference kilogram has been
shedding mass over time, and is down by 50 micrograms.) “This
garbage-collection algorithm has been tested against the platinum-iridium
cons cell in Paris.” Compare golden.
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