Gram (g)
The gram (g) is the core unit of mass in the metric system. Originating in France in the late 1700s during metrication, it was originally set as the weight of a single cubic centimeter of water at 4°C, the point of water’s greatest density. This definition grounded the gram in both practicality and scientific accuracy. As the cornerstone for all metric mass measurements, the gram supports precise calculations and global consistency. Today, it is a fundamental unit in scientific research, culinary arts, and commerce, valued for its straightforwardness and universal application.
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.