K = slip ratio = ratio of vapor velocity to liquid velocity SUBSCRIPTS f = liquid phase g = vapor phase c = critical flow conditions o = experimentally observed conditions th = isentropic conditions rn = nonisentropic conditions G = gross properties at a section ConclusionsWithin th? range of these experiments (pressure between 14.7 and 45 p.s.i.a. and groas quality between 5 and 100%) whose continuous phase is the vapor:The acoustic velocity in wet steam has a constant value, independent of mixture quality, which is approximately equal to the acoustic velocity in dry steam.Reynolds' description of the critical flow phenomenon appears valid for wet steam.Extraction of nickel b y formation of the volatile carbonyl is a well known metallurgical operation, but little information is available concerning the rate. Kinetic data for the formation of nickel carbonyl were obtained by passing purified carbon monoxide through a fixed bed of freshly reduced nickel powder at temperatures from 25" to 150" C. and pressures from 1 to 4 atm. Powders of reproducible reactivity were obtained by hydrogen decomposition of nickel oxalate dispersed in finely divided fused silica to prevent sintering of the nickel. The rate of the surface chemical reaction appeared to control the over-all reaction rate, which reached a maximum at about 75" C. a t all pressures, The reactivityof the nickel was influenced by both pressure and temperature. A modified first-order rate equation was found to correlate the data when an empirical term was introduced to account for changes in the reactivity of the nickel with temperature and pressure.REACTIOS receiving renewed attention in the field of extrac-

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