Graham's answer works since there is no phase change with CNG. It is all gas. If it were changing phase from liquid to gas then the pressure gauge is a poor measure of level. This would be the case with LNG (liquid Natural Gas) or LPG (Liquid Propane Gas). Hence the reason the cylinders are called 1lbs or 20lbs and his reason for weighing his to determine level. Also the reason that they are filled on a scale.
Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Jul 24, 2016 8:54 AM, "G Collins via CnC-List" <cnc-list@cnc-list.com> wrote: > A bit over half full. The ideal gas law says PV=nRT, and the only > factors changing are P = pressure and n = amount of the material. > > I keep track of my propane by weighing the cylinder. > > Graham Collins > Secret Plans > C&C 35-III #11 > > On 2016-07-24 9:13 AM, Hoyt, Mike via CnC-List wrote: > > We have been cruising over a week. Cng was refilled and at 2500 psi. Now > 1500 psi. > > > > Does that mean nearly empty or half full? > > > > Mike > > Persistence > > Halifax > > _______________________________________________ > > > > This list is supported by the generous donations of our members. If you > like what we do, please help us pay for our costs by donating. All > Contributions are greatly appreciated! > > . > > > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > like what we do, please help us pay for our costs by donating. All > Contributions are greatly appreciated! >
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