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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 has seven base units, including the metre (m) as the unit of length, and 22 coherent derived units with special names and symbols.
Learn about the history, current practice and variations of different systems of units of measurement, such as the metric system, the imperial system and the US customary system. Compare the base units, derived units and prefixes of each system and their applications in science, commerce and everyday life.
Learn about the history, philosophy, and units of the metric system, a set of systems of measurement based on decimal multiples and submultiples. Find links to articles on SI units, cgs units, and other metric variants.
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.
The U.S. customary system is a system of measurement units derived from English units and used in the U.S. and some territories. It is based on the inch, foot, yard, and mile for length, and the pound, ounce, and gallon for mass and volume.
Learn about the different units of length used around the world, including the metric system, the imperial system, the U.S. customary system, and various scientific units. The meter is the base unit of length in the metric system and the International System of Units (SI).
Learn about the history and differences of the imperial and US customary systems of units, derived from an earlier English system that traces back to Ancient Roman and Saxon units. Compare the units of length, weight, volume and area used in the UK, the US and its territories.
The kelvin is the SI unit of thermodynamic temperature, defined by taking the fixed numerical value of the Boltzmann constant k to be 1.380 649 × 10−23 when expressed in the unit J K−1. The kelvin is part of the set of seven SI base units that define the International System of Units.