The Bohm criterion is an inequality signifying that the ion flow speed at the plasma boundary must be at least as great as the ion sound speed in order for a sheath to form at the boundary. A physical explanation for this phenomenon is given, and the phenomenon is compared with the flow of falling water.
No takes yet. Share an insight, caveat, or question.
Greg Severn (2006) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: