Kilogram (kg)
The kilogram, symbolized as kg, is the SI base unit of mass, equivalent to 1,000 grams. Introduced in France in 1795, it was historically defined by a platinum-iridium physical prototype stored near Paris. In 2019, the kilogram was redefined by reference to the Planck constant for a universal and precise definition based on physics rather than an object. The kilogram is fundamental in science, industry, and daily life, providing a standardized unit of measurement for a broad range of applications. Its adoption ensures seamless consistency worldwide.
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.