Consequently, erroneous flow readings due to {HEAD ~ diffusion} of {TAIL ~ a lighter gas} through the soap film are eliminated 
Consequently , erroneous flow readings due to { HEAD ~ diffusion } of { TAIL ~ a lighter gas } through the soap film are eliminated
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH