Final answer:
A statement showing two quantities with different units as equal is called an 'equivalence.' This is used to convert from one unit to another, such as inches to centimeters or ounces to pounds.
Step-by-step explanation:
A statement that shows two quantities with different units are equal to each other is called an equivalence. The term equivalence in measurements means that the two different units represent the same quantity and can be used to convert from one unit to another. For instance, if you know that 1 inch is equivalent to 2.54 centimeters, you can use this equivalence to convert inches to centimeters or vice versa.
Equivalencies are critical in many aspects of measurements, such as volume, weight, and other units of measurement. When you are converting between units, such as ounces to pounds or meters to feet, you use the established equivalences between those units to make an accurate conversion.