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#1
02-26-2010, 01:58 AM
 Michel Khazzaka Junior Member Join Date: Feb 2010 Posts: 1 Rep Power: 0
Conversion pascal to mmwg

I had difficulty to converge mmwg to pascal
#2
02-26-2010, 03:27 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,443 Rep Power: 19
Re: Conversion pascal to mmwg

Quote:
 Originally Posted by Michel Khazzaka I had difficulty to converge mmwg to pascal
The density of water varies with temperature, so the conversion does too; it also varies with local gravity. Most people use a "conventional" conversion based on max density at 4 °C, and standard gravity at about 45° latitude, and ignore the roughly half percent variation from equator to poles.

That is 1 mm H2O = 9.80665 Pa

For real water in real gravity, "your water may vary." It might be better to use 9.8 and admit water gauge has no real precision.
#3
03-23-2011, 10:23 PM
 neeraja.j011@gmail.com Guest Posts: n/a
how can i know about the vrla battery testing

i wanna know d testing of vrla battery?
#4
05-10-2012, 10:53 PM
 Unregistered Guest Posts: n/a
Re: how can i know about the vrla battery testing

Quote:
 Originally Posted by neeraja.j011@gmail.com i wanna know d testing of vrla battery?
Hi, there are various tests for batteries.
I hope you are referring to the capacity test.
Normal capacity test:-
connect a suitable load resistor and an ammeter and a volt meter.
You also have fabricated capacity testers with energy meter.
discharge the battery to its minimum permissible volt per cell.
stop the test when any one cell voltage drops below 1.8V (typical for LA Batt)
Amps X hours give you AH.

Another short cut method is to use a heavy discharge cell/Batt tester.
momentary heavy discharge is done with high load resistor (dissipates heat).
easy read scale with green /red markings available.

hope this good for now
Regards
Rajkumar

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