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) without success.
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? Thanks, mike