Just to make sure I got this right...
In my example, the volume (of air in a tube capped at both ends) decreases from 47.1 to 44.7 or 5.1%...
Then the pressure would have increased 0.76 PSI (15PSI x 5.1%)
And I would need a switch able to detect < 1PSI increase in pressure.
...sounds...
I'd like to calculate the change in air pressure within a long tube - like the driveway hoses at gas stations.
The static pressure is zero, a vehicle drives over the hose and the increase in pressure activates a switch. I'm trying to determine the proper switch size (in PSI).
So, here is...