Some of the standard units of measurements in the United States include feet, inches and miles for measuring length; pounds and ounces for measuring weight; and quarts, ounces and liters for measuring volume of liquid. In addition, temperature is usually measured using Fahrenheit degrees.
The customary units of measurement in the United States differ from the units used in most other countries. They are based on British units of measurement that were in use before American independence. However, in the 19th century, Britain switched to using the Imperial system of measurement, while the United States kept many of the old units. U.S. customary units are primarily used in commerce and personal settings, while most medical and scientific settings use Imperial units.