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The International System of Units, universally abbreviated SI (from the French Le Système International d’Unités), is the modern metric system of measurement. The SI is the dominant measurement system used in science and international commerce. In recognition of this fact, Congress has designated the metric system of measurement as the
This publication lists the units of the International System of Units (SI), or metric system, recommended for use in trade and commerce and other general uses by the National Institute of Standards and Technology.
The International System of Units, universally abbreviated SI (from the French Le Système International d’Unités), is the modern metric system of measurement. Long the dominant measurement system used in science, the SI is becoming the dominant measurement system used in international commerce.
This is a unit-at-a-glance list. You can also download a PDF version for off-line use. Table I. Basic units Table II. Derived units with assigned names Table III a. SI Units prefixes Table III b. Binary prefixes for Bytes Table IV. Accepted non-SI units Table V. Accepted non-SI units with experimental values Table VI. Units deprecated by the SI
SI units of measurement. The basic units. The Laws of Physics are expressions of fundamental relationships between certain physical quantities. There are many different quantities in physics.
By default, the second (s) became the universal base unit of time. It is the only SI unit that predates the metric system. Most SI units incorporate the second, so it is essential in calculations. But clocks record hours (h) and minutes (min), and the day (d) and year (a) are vital natural units.
The International System of Units, the SI, has been used around the world as the preferred system of units, the basic language for science, technology, industry and trade since it was established in 1960 by a resolution at the 11th meeting of the Conférence Générale des
