Krypton filling limits

The maximum authorized filling limit for neon, krypton, and xenon in approved types of cylinders is the marked service pressure of the cylinder at 70°F (21.1°C) (or, in the case of specification 3 A and 3AA cylinders meeting additional specified requirements, 10 percent in excess of the marked service pressure). Because commercial grades of xenon deviate markedly in physical properties from the ideal gas at elevated pressures, maximum filling limits for the specific commercial grade of xenon being used must be determined experimentally. 

Krypton is expensive to produce, which limits its use as an inert gas. It is used in a mixture with argon to fill incandescent light bulbs, fluorescent lamps, lasers, and high-speed photography lamps. Radioactive Kr-85 is used as a source of radiation to measure the thickness of industrial materials. It is also used to test for leakage of scientific instruments. 

We studied melting in the layers adsorbed in hypothetical single wall armchair carbon nanotiibe of diameter d = 4 nm. This study was limited to partially filled pores, where only one or two layers were adsorbed. Aldiough the adsorbed syston was krypton, most of the qualitative observation is valid in many odier similar systems. 

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