Since a gallon of water weighs approximately 8.34 pounds, 55 gallons weigh 55 x 8.34 = 458.7 pounds.
That depends on what kind of substance occupies the 55 gallons of space.If it's 55 gallons of air, then there are very few kilograms of mass in it.If it's 55 gallons of water, then its mass is about 208 kilograms.If it's 55 gallons of granite, then its mass is a lot more than 208 kilograms.If the 55 gallons of space is empty, then there are no (zero) kilograms of mass in it.
There's no direct conversion. It all depends on what's in the 55 gallons. If it's 55 gallons of air, then it's very few pounds. If it's 55 gallons of water, then it's around 460 pounds. If it's 55 gallons of stones or lead, then it's a lot more pounds than that. If it's 55 empty gallons, then it's no pounds at all.
If the pipe is round, with a 55-foot diameter, and 36 inches long, then its capacity is 53,317.3 gallons. If the pipe is round, with a 36-inch diameter, and 55 feet long, then its capacity is 2,908.2 gallons. Either way, we have no way of knowing how much water is in it. For all we know, it may even be empty.
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