Being reading through the posts and it can be a bit confusing to wrap my hear around. I do have a couple questions, for the life of me I don't understand psig, as I understand it at sea level it is going to be a ballpark of psig +14. So for the charts does that mean at 40psig the regulator pressure is at around 55psi.
In practical terms if we consider the Key flowmeter as a option, can a user with this particular flowmeter adjust as low as say 1 bubble every couple seconds at the low end and at what psi at the regulator?. I know there is so much variability, but just a ballpark is this doable with a flowmeter that has been covered in the thread?
depends on where you use the unit, roughly speaking, 0 Psig is air pressure at sea level, 0 Psia is atmosphere pressure without air.
and 0 psig= 14.7 psia
If it is psi we use in this thread, is the psig, it is the unit you read on the co2 regulator gauges.
For the psia, because this unit most always preferred as spec data on the flowmeter data sheet, we use it sometimes and always mention 14.7 psia
as 0 psig...
Bubble size varies, a bubble double in diameter and the volume increase 8 times of the original, and different pressure, different media, different flow rate.... are factors contribute to the different size of the bubbles.
That is why we use high precision flowmeter, so we know exactly the flow rate of co2 and how much co2 goes into the planted/reef tank at a time interval.
add: you just remind me to check my previous work on the calibration measurement, some of the reading may be off and error occurred because the data sheet use psia, I will check and see if I did make mistakes, and will correct them if I did.