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.
US liquid gallons
A US liquid gallon is a volume measurement used in the United States for liquids such as water, gasoline, and milk. One US liquid gallon is about 3.78541 liters. A standard bathtub is about 80 gallons of water and a car gas tank can hold anywhere between 12 and 20 gallons of gas.