So, what you are probably re â¦ ferring to is 'energy'. The SI unit of energy is the joule (J). An alternative unit, used by electricity utility companies for the purpose of billing its consumers, is the kilowatt hour (kW.h).
a typical steel 30 pound liquid propane tank weighs about 25-28 pounds empty. propane tank markings (on collar) propane weighs about 4.125 pounds per gallon and a 30 po â¦ und tank will hold about 7.5 gallons so a full tank will weigh about 55 pounds or so. /source: wiki.answers.com/.
propane weight is the total weight of propane that should be placed in your tank it is calculated as 42 % of the water content value total weight is the combined weight of the tank product and nozzle as it sits on the scale when full to double check a filled tank disconnect the nozzle and reweigh the tank