I want to measure changes in air pressure in the
under 10 pascal range. I'm interested in relative
measurements, so absolute accuracy is not an issue.
I have a digital manometer, but it has resolution
of only 2 pascals. I'd like to have maybe 10x that resolution.
If my math is correct, a pascal is about .004" of water.
I made a quick attempt to build an inclined tube
manometer with water. Surface tension of the water
is greater than the pressure being measured. Tried
dishwasher soap as a surfactant (cause it was handy)
Next experiment is to blast a tiny air jet onto something
light like gold leaf??
Any ideas on how to fashion a temporary gizmo
to do what I want?