This means that (ldb (byte 3 0) number) gives the remainder of number divided by 8, and (ash number -3)gives the quotient of number divided by 8. You can collect the octits in order from least to most significant significant octit by collecting (ldb (byte 3 0) number) and updating number to (ash number -3).
Most BBQ propane tanks hold 20 pounds of gas, when full. The total weight is the 20lbs plus the tare (empty) weight of the tank. You can usually find this stamped into the neck ring. Checking the level of remaining gas, in a gas bottle, is an easy process.
120 Gallon Tank. A standard 120 gallon tank holds 96 gallons of propane and is generally installed for residential hot water or space heating with sufficient storage if you add a range or clothes dryer. Each tank is 54.5â in height and 30â in diameter. Also known as a 420 lb.