Results are presented for the recombination coefficient of hydrogen atoms on a stainless-steel surface as a function of pressure, temperature, and concentration. These results are compared with theoretical predictions. Results are also presented for a heat-transfer ratio. The results cover a range of Knudsen numbers from 0.08 to 4.2, a range of Reynolds numbers from approximately 0.004 to 0.2, and an upstream Mach number of approximately 0.1.

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