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The butt was a measure of liquid volume equalling two hogsheads. This equated to 108 imperial gallons (490 l) for ale or 126 imperial gallons (570 l) for wine (also known as a pipe).
The petaliter or petalitre is a common metric unit of volume. It is equal to 1 000 000 000 000 cubic meters. Plural name is petaliters.