On February 17, 2012 at 09:16, jzoz01 said...
Propane is stored as a liquid. The gas pressure in the tank varies with tempature, not volume, so measuring gas pressure wouldn't tell you anything. Unless there is a float or something inside the tank, I'd think measuring weight of the tank would be the only way to determine the level.
Yes you are correct that the pressure varies by temperature but you can go down to Walmart and get a gauge for your gas grills propane tank that gives a reasonably accurate measurement. Analog gauges are on every large propane tank I've ever had. No need to weigh the tank. They just know that it's accurate within a certain percentage and call it acceptable.
