Tuesday, December 11, 2018
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Wzorzec kilograma (6)

! EN_01349480_0005 NYT
Attendees photograph a silicon-crystal sphere, left, and a Kibble balance at the General Conference on Weights and Measures in Versailles, France, Nov. 16, 2018. International scientists voted unanimously here to redefine the kilogram and three other basic units of measurement: the, the mole, the kelvin, and the ampere. (Matt Roth/The New York Times)
MINIMALNA CENA 100USD!!!
! EN_01349480_0001 NYT
One of the roundest man-made objects in the world, a sphere of single-crystal silicon weighing one kilogram, at the National Institute of Standards and Technology in Gaithersburg, Md., Nov. 9, 2018. International scientists have voted to redefine the kilogram and three other basic units of measurement: the, the mole, the kelvin, and the ampere. (Matt Roth/The New York Times)
MINIMALNA CENA 100USD!!!
! EN_01349480_0002 NYT
One of the roundest man-made objects in the world, a sphere of single-crystal silicon weighing one kilogram, at the National Institute of Standards and Technology in Gaithersburg, Md., Nov. 9, 2018. International scientists have voted to redefine the kilogram and three other basic units of measurement: the, the mole, the kelvin, and the ampere. (Matt Roth/The New York Times)
MINIMALNA CENA 100USD!!!
! EN_01349480_0003 NYT
A scale made from Legos, for recreational purposes only at the National Institute of Standards and Technology in Gaithersburg, Md., Nov. 9, 2018. Since 1889, the official kilogram, the one which others are measured against, has been a platinum-iridium cylinder kept under lock and key near Paris. A century of research later, there is now a definition based on an abstract constant of nature. (Matt Roth/The New York Times)
MINIMALNA CENA 100USD!!!
! EN_01349480_0004 NYT
Two prototype kilograms kept at the National Institute of Standards and Technology in Gaithersburg, Md., Nov. 9, 2018. The kilogram at left, K4, was made in 1889 from the same platinum-iridium alloy stock as the prototype in France which has for more than a century been the official kilogram, the one with all others were measured against. At right is kilogram K102, which was made in 2013. (Matt Roth/The New York Times)
MINIMALNA CENA 100USD!!!
! EN_01349480_0006 NYT
Stephan Schlamminger watches the vacuum chamber lift off a Kibble Balance at the National Institute of Standards and Technology in Gaithersburg, Md., Nov. 9, 2018. Since 1889, the official kilogram, the one which others are measured against, has been a platinum-iridium cylinder kept under lock and key near Paris. A century of research later, there is now a definition based on an abstract constant of nature. (Matt Roth/The New York Times)
MINIMALNA CENA 100USD!!!

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Rocznice 2018 Na wyłączność