The International Temperature Scale of 1990 is an equipment calibration standard specified by the International Committee of Weights and Measures for making measurements on the Kelvin and Celsius temp
Glass cell for Fixed point of water
Neon
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Neon is a chemical element; it has the symbol Ne and the atomic number 10. It is the second noble gas in the periodic table. Neon is a colorless, odorless, inert monatomic gas under standard condition
Neon gas-discharge lamps forming neon's element symbol
The first evidence for isotopes of a stable element was provided in 1913 by experiments on neon plasma. In the bottom right corner of J. J. Thomson's photographic plate are the separate impact marks for the two isotopes neon-20 and neon-22.
The emission spectrum of neon shows individual wavelengths of light contributing to its perceived color when heated.