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absolute pressure Alkali Metals approximately area ratio best represented calculated from equation CHARACTERISTICS OF POTASSIUM chemical species expansion chemical species process Cond9n condensation conditions is shown convergent-divergent nozzle critical weight-flow rate dashed lines equation Pv11 equilibrium chemical species equilibrium process expansion and flow expansion follows expansion index experimental data EXPERIMENTAL NOZZLE EXPANSION flow characteristics following the equation indicated superheat isentropic last two taps Lewis Research Center liquid molal NASA Nozzle Inlet Conditions nozzle inlet pressure nozzle inlet temperature percent pounds per square pressure data pressure taps range investigated ratio with area reference 9 reported in reference represented by dashed research assembly saturated inlet conditions shown in figure sodium vapor specific heat specific volume superheated inlet conditions superheated potassium vapor supersaturated supersaturated-equilibrium chemical species supersaturated-frozen chemical species theoretical supersaturated-equilibrium chemical three theoretical processes throat area variation of pressure virial coefficient volumeter W/At wall tap weight-flow rate W/A wet potassium vapor