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.
Depends on the manufacturer and specification standard of the tank, but roughly speaking at this capacity, there is about 2 pounds of steel for each gallon of capacity, so vacâ¦uum purged, the tank would weight approximately 400 lb. If it is filled with propane, each gallon of propane is 4.2 pounds at 60 degrees.