Stone (st)
The stone (st) is a traditional British unit of mass, standardized as 14 pounds, which is roughly 6.35 kilograms. Its history dates back to medieval England, when stones of different weights were used as standards in trading. While most countries now use kilograms for official measurements, the stone is still frequently used in the UK and Ireland, especially to state a person’s body weight. Its ongoing use highlights both cultural tradition and the continued relevance of non-metric measures in everyday life.
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.