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A table of mass levels from 10 −67 kg to 10 52 kg, with SI units and names. The web page also explains the units of mass, the least and most massive things, and the mass of the observable universe.
Deci is a metric prefix that means one tenth of a unit. It is used with units like metre, litre, and second to form centimetre, millilitre, and millisecond. Learn about the history, symbols, and adoption of other metric prefixes in SI and non-SI units.
The International System of Units (SI) is the modern form of the metric system and the world's most widely used system of measurement. It consists of seven base units, 22 derived units with special names and symbols, and 24 prefixes for decimal multiples and submultiples.
A gram is a unit of mass in the International System of Units (SI) equal to one thousandth of a kilogram. Learn about the origin, definition, uses and conversion factors of the gram, and see examples of its applications in cooking, drugs and coins.
The curie (Ci) is a non-SI unit of radioactivity named after Pierre and Marie Curie. It is equal to 3.7×1010 decays per second and can be converted to becquerel (Bq) or other units using the rules of radioactive decay.
A grain is a unit of mass equal to 64.79891 mg in the troy, avoirdupois, and apothecaries' systems. Learn how to convert grains to other units, such as pounds, ounces, or milligrams, and see examples of grain usage in different fields.
Learn the definition, notation, units and properties of mass concentration, a measure of the mass of a constituent per unit volume of a mixture. Find out how it differs from molar concentration and how to convert it to other related quantities.
Learn how to convert units of measurement using conversion factors, which are fractions that cancel out the original units and leave the desired units. See examples of conversion factors for length, speed, concentration and more.