The overpressure at which {HEAD ~ the valve} opens depends on {TAIL ~ the surface tension} of the carrier liquid and the mean pore diameter of the carrier material according to the equation p = 2 gamma/R, where gamma is the surface tension and R the mean pore diameter of the carrier material 
The overpressure at which { HEAD ~ the valve } opens depends on { TAIL ~ the surface tension } of the carrier liquid and the mean pore diameter of the carrier material according to the equation p = 2 gamma / R , where gamma is the surface tension and R the mean pore diameter of the carrier material
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH