Final answer:
The English system is commonly used in the United States, while the metric system (International System of Units) is widely adopted in the scientific and engineering fields.
Explanation:
The most commonly used system of measurement in the United States is the English system, also known as the United States customary units. This system defines measurements using units like inches, feet, miles, gallons, pounds, and degrees Fahrenheit.
The metric system, also known as the International System of Units (SI), is used globally and by scientists and engineers in the U.S. This system is entirely decimal and uses units like meters, kilograms, and Celsius for temperature.
While the U.S. primarily uses the English system, the metric system is widely adopted in the scientific and engineering fields, offering advantages like consistent prefixes for powers of ten and logical unit conversions.
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