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A table of mass levels from 10 −67 kg to 10 52 kg, with SI prefixes and units. A nanogram (ng) is 10 −9 g, or one billionth of a gram, and is the smallest SI submultiple of gram.
Learn about the different types of metric units, including the International System of Units (SI), the CGS system, and other systems based on the metre, gram or second. Find the definitions, symbols, and conversions of various metric units for length, mass, time, and more.
The metric system is a decimal-based system of measurement that uses seven base units and metric prefixes. It evolved from the French Revolution and is now the official system of weights and measures in most countries.
A table of examples of lengths in different orders of magnitude, from the size of the universe to the diameter of a proton. The smallest measurement is 10−13 cm, which is about 100,000 times smaller than a human hair.
Learn about the metric prefixes, also known as SI prefixes, that are used to indicate multiples or submultiples of a unit in the International System of Units (SI). See the list of 24 prefixes, their symbols, names, and adoption dates, as well as the rules for combining them with unit symbols.
The SI is the modern form of the metric system and the world's most widely used system of measurement. The kilogram is the SI unit of mass, defined by taking the Planck constant h to be 6.626 070 15 × 10−34 J⋅s.
A physical quantity is a property of a material or system that can be quantified by measurement. Learn about the components, symbols, dimensions, units, and kinds of physical quantities, as well as the International System of Quantities and other conventions.
The kilogram is the base unit of mass in the SI system, defined by three constants: the Planck constant, the speed of light and the hyperfine transition frequency of 133 Cs. Learn about its origin, previous definitions, spelling variations and related terms.