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воскресенье, 24 сентября 2017 г.

Krypton: Did you know?

Krypton: Did you know?

materialsscienceandengineering:



From 1960 to 1983 the length of a meter was defined as 1,650,763.73 wavelengths of krypton-86’s orange-red spectral line.


Source.



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