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.
Metric teaspoons
Metric teaspoons are units used for measuring small quantities of liquid or dry ingredients. One metric teaspoon is 5 milliliters.