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).
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.