The question MUST be very simple! it is a 3 mark question, the first question of a first year Mech. Eng. Thermodynamics exam... 1. The problem statement, all variables and given/known data A boiler produces wet steam at a pressure of 8.5 bar. A sample of the steam is passed through a throttling calorimeter. At the calorimeter exit, it reads 2 bar, 141 ºC. Determine the dryness fraction (quality?) of the wet steam if the process is adiabatic. 2. Relevant equations First Law : Q-W=E2-E1 (needed?) Steam Tables PV=RT (does it apply??) X= (v-vf)/(vg-vf) 3. The attempt at a solution I am very confused as to how to use the steam table and where and when each applies. Also, I do not know where to find v, and if PV=RT applies in the superheated region. Any help is much appreciated.