Final answer:
The unit method, exemplified by the metric system, allows for easy conversion between units through powers of 10, and enables simpler comparisons of physical quantities than the group or composite methods. It also accommodates a vast range of values with the use of metric prefixes, enhancing its applicability across fields.
Step-by-step explanation:
The advantages of the unit method over the group or composite method can be exemplified by comparing the metric system to non-metric systems. Using the metric system, conversion between units is facilitated since it involves only powers of 10. For example, there are 100 centimeters in a meter, and 1000 meters in a kilometer. This simplicity allows for easier comparison of physical quantities and eliminates the often complex conversions required by non-metric systems, such as 12 inches in a foot or 5280 feet in a mile, which are not based on a uniform division.
Furthermore, the metric system allows the same unit to be adapted over a vast range of values by simply changing the metric prefix. This means distances can be measured in meters for construction, in kilometers for air travel, or in nanometers for optical design without the need to create new units for different scales or purposes. It leads to a more universal and streamlined approach to measurement that is suitable across various fields and applications.