Originally Posted by mrphotoman
take a 6" coffee can and open both ends then breathe through it.
it is very easy isn't it.
now take a 6" coffee can and only open one end then poke a small hole in the other end and stick a straw in it.
breathe through the straw, big restriction..
not a valid illustration ...
to be valid in this case, your 6" can, open only at one end should have an opening at the opposite end of 5.3" ....