What is 0.1 of a gram called

0.1 gram is called a decigram (dg) in formal SI nomenclature, though this term is rarely used in everyday practice. More commonly, masses at this level are simply expressed as decimal fractions of a gram (0.1 g) or converted to milligrams (100 mg), since the prefix "milli-" (1/1000) is more familiar than "deci-" (1/10) in scientific and technical contexts. Milligrams are the preferred unit for pharmaceutical dosing, chemical measurements, and precision weighing applications.

In practical use, laboratory balances and analytical scales display measurements in grams with decimal precision rather than using decigram notation. For example, a measurement would appear as "2.3 g" rather than "23 dg" because decimal gram notation is universally understood and aligns with how precision balances operate. The decigram unit exists within the SI system alongside other uncommon prefixes like decimeter and deciliter, but these have been largely supplanted by decimal notation for fractions and more familiar prefixes (milli-, micro-) for very small quantities. When recording precise mass measurements, scientific practice favors expressing results in grams to three or four decimal places (for example, 0.1257 g) or converting to milligrams (125.7 mg) depending on the context, which provides clearer communication than using less common metric prefixes.