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/.
GRILL GAUGE INSTANTLY CATCHES UNDER-FILLED PROPANE TANKS! It is well publicized that certain propane companies have lowered the fill levels in standard 20.0 pound LP tanks to only 15.0 pounds â which is approximately 25% below the legal, safe-fill limit!