Hmm yes one could call it binary.
1. Live Stem vs Dead Stem - Referance movie with Steve McQueen. Sand Pebbles. Good training material. That 30 seconds kept us Nukes entertained for a week.
2. Hmmm maybe not so binary - degree of saturation.
Also temperature and pressure (take pick if saturated)
3. Superheated ??
What do you want to drive the tractor with recip engine or turbine?
Nostalgia in me says recip.
Also turbines do not have a bunch of gizmos to watch go back and forth.
Kind of like politicians - they just go in circles.
Dan Bentler