A treatise on chemistry / by Sir H.E. Roscoe, F.R.S., and C. Schorlemmer.

  • Henry Enfield Roscoe
Date:
1905-
Catalogue details

Licence: In copyright

Credit: A treatise on chemistry / by Sir H.E. Roscoe, F.R.S., and C. Schorlemmer. Source: Wellcome Collection.

    936/954 page 918
    Absolute ( — 72 -5 C.), and the critical pressure 54 3 atmospheres. The refractivity of the gas is T449 (air = l).1 The density of krypton is 40 0 (H = l) and it is monatomic, so that its atomic weight is 8T2. With a discharge of low intensity the gas gives in a vacuum tube a yellowish-green glow, the spectrum of which contains conspicuous lines in the yellow and green, whilst with a more intense discharge the glow becomes blue and gives a very complex spectrum (Baly).2 XENON, X = i27 (H = i). = 128 (O = 16). 532 Xenon is at once the least volatile and the least abundant of the inert gases which are known to exist in the air, and is only present in the proportion of 1 part in 20,000,000 by volume (Ramsay and Travers). It boils at 103 '9 Absolute (— 109°'l C.), at which temperature its density is 3'52, and has the critical temperature 287°'8 Absolute ( + 140,8 C.), and the critical pressure 57*2 atmospheres. It readily solidifies at the tem- perature of liquid air, and the solid volatilises at a higher temperature without melting. The refractivity of the gas is 2 364 (air = IV The density of the gas is 63*5 (H = l), so that its atomic weight is 127. The spectrum, like that of argon and krypton, changes with the intensity of the discharge. With one of low intensity the glow of the tube is blue, the spectrum containing only faint lines in the red and green. When a spark gap and Leyden jar are introduced the glow becomes green, and a large number of green lines are present in the complex spectrum which is then seen (Baly). 1 Ramsay and Travers, Proc. Roy. ISor., 190], 67, 331. - See also Livcing and Dewar, Proc. Roy. Soc., 1901, 68 * 389.
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