Which unit is equal to 2.2 pounds?

The correct unit that is equal to 2.2 pounds is 1 kilogram. This conversion is based on the fact that the kilogram is a standard unit of mass in the metric system, and it is widely accepted that 1 kilogram is approximately equal to 2.2 pounds. This relationship is important in various fields, including medicine and science, where conversions between the metric and imperial systems are often necessary for accurately measuring weight.

In understanding weight conversions, it's essential to recognize the efficiency of the metric system in providing a unified way to express weight (through grams and kilograms) as opposed to the imperial system (which measures in pounds and ounces). This helps ensure clarity and consistency in contexts such as patient care and pharmacology, where precise measurements are critical.