A confusing unit of measure is a barrel. A barrel's capacity is determined often by who uses the term, or what it contains.
For example:
1 barrel (bbl) of petroleum or related products = 42 gallons.
1 barrel of Portland cement is 376 pounds.
1 barrel of flour - 196 pounds.
1 barrel of pork or fish - 200 pounds.
1 barrel of (US) dry measure is 3.29122 bushels or 4.2104 cubic feet.
A barrel may be called a "drum", but a drum usually holds 55 gallons!
1 barrel going over Niagara Falls was big enough to carry a man.
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