US oil barrels
A US oil barrel, also known as a petroleum barrel, is a volume unit used in the oil and gas industry to measure crude oil or liquid petroleum gas (LPG). One US oil barrel is 42 US gallons or about 159 liters.
UK gills
UK gills are volume measurements for liquids in the United Kingdom. One UK gill is equivalent to a quarter of a UK pint (about 142 milliliters).