Wolfram Research
Wolfram Science World: United States System of Liquid and Dry Measures
Unlike the British Imperial system, the United states uses two different systems, one for liquid volumes and one for dry volumes. Confusingly, these two systems share the units of quart and pint, which have different values. This site...
Curated OER
Teachnet: Remembering Units
Find some ideas that other teachers use to teach about gallons, quarts, pints, cups, and ounces. Mr. Gallon is a very unique elementary technique for teaching this concept.