Centigram (cg)
The centigram is a metric unit of mass equal to one-hundredth of a gram or 10 milligrams. Abbreviated as "cg", it occupies the gap between milligrams and decigrams in the metric prefix system. While rarely used in everyday life, the centigram appears in analytical chemistry, gem grading subdivisions, and educational contexts teaching metric prefixes.
Definition
One centigram equals exactly 0.01 grams, 10 milligrams, 0.00001 kilograms, or approximately 0.154 grains. There are 100 centigrams in a gram. The centigram is formed by applying the SI prefix "centi-" (one-hundredth) to the gram.
History
The centigram was established as part of the metric system during the French Revolution, formed by applying the prefix "centi-" (one-hundredth) to the gram. Like other intermediate metric prefixes (deci-, deka-, hecto-), the centigram never achieved the everyday prominence of the milligram or gram. It remains a valid SI unit but is infrequently used because milligrams provide sufficient resolution for most practical small-mass measurements.
Common Uses
The centigram has few dedicated modern applications. It occasionally appears in analytical chemistry for expressing small masses, in gem-weight subdivisions (one carat equals 20 centigrams), and in educational materials teaching the metric prefix system. In practice, milligrams are preferred for small-mass measurements and grams for larger ones, making the centigram largely redundant.
Did You Know? Facts About Centigram
- One carat (used for gemstones) equals exactly 20 centigrams or 200 milligrams.
- The centigram is one of the least commonly used metric prefixes in daily life, alongside the decigram and dekagram.
- A single grain of rice weighs roughly 2.5 centigrams (25 milligrams).
- Despite being rarely used, the centigram is a valid SI unit and appears in metric conversion tables worldwide.
- The centigram is to the gram what the centimeter is to the meter - one-hundredth of the base unit.