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.
Metric cups
Metric cups are used in cooking and baking to measure ingredients such as flour and sugar. One metric cup is 250 milliliters or a quarter of a liter.