Ounce (oz)
The ounce, symbol oz, is an imperial unit of mass derived from the Roman uncia, meaning “one-twelfth” of a pound. Standardized over centuries in England and later in the United States, one ounce is equivalent to 28.3495 grams. The ounce continues to be used for measuring food, postal items, and precious metals in regions employing imperial or US customary units. Its historical background and ongoing applications sustain its relevance alongside metric units.
Milligram (mg)
The milligram, symbol mg, equals one-thousandth of a gram and is widely used in science, medicine, and nutrition. Established with the metric system in the late 18th century, the milligram enables precise measurement of small masses. It is essential in pharmaceuticals, chemistry, and laboratory research, where small variations can be significant. The milligram demonstrates the metric system’s versatility by supporting both everyday and scientific measurements, ensuring accuracy across various disciplines.