Final answer:
The claim that the customary measurement system is the most widely used outside the US is false; the customary system is predominantly used in the US, while the metric system is used internationally. The customary system includes units like inches and pounds, and understanding the equivalencies between these units is essential for accurate measurement.
Step-by-step explanation:
The statement that the customary measurement system is the most widely used, especially outside the United States, is false. In fact, the customary measurement system, which includes units such as feet, inches, pounds, cups, and gallons, is primarily used in the United States. For measurements of length, this system uses inches, feet, yards, and miles. On the other hand, most other countries use the metric system for their measurements, which includes meters and kilograms, among others.
When it comes to choosing appropriate tools for customary measurement, it's important to note that these are tools specifically designed for the U.S. standard units. Examples include rulers with inches and feet, scales in pounds, and liquid measures in gallons and cups. For converting customary units of measure, there are specific relationships between these units. For instance, 12 inches make up a foot, 3 feet make one yard, and 1760 yards equal a mile.
Finally, understanding the concept of equivalence is key when dealing with the customary system. Equivalence refers to the condition of having equal value or meaning. In terms of measurement, this may mean recognizing that 16 ounces equals 1 pound or that 2 pints equals 1 quart. It is crucial for using measurements accurately within the customary system.