{HEAD ~ Relative motion} between the liquid mass and {TAIL ~ upper and lower case structures} generates a voltage potential between the upper and lower cases, representing the relative velocity 
between
{ HEAD ~ Relative motion } between the liquid mass and { TAIL ~ upper and lower case structures } generates a voltage potential between the upper and lower cases , representing the relative velocity
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH