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The International System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement.
The International System of Units or SI units defines standard units for measurement of all physical quantities. In principle, any physical quantity can be expressed in terms of seven base units.
International System of Units (SI), international decimal system of weights and measures derived from and extending the metric system of units. SI has seven basic units, from which others are derived: the second, the meter, the kilogram, the ampere, the kelvin, the mole, and the candela.
12 Απρ 2010 · The International System of Units (SI), commonly known as the metric system, is the international standard for measurement. The International Treaty of the Meter was signed in Paris on May 20, 1875 by seventeen countries, including the United States and is now celebrated around the globe as World Metrology Day.
The International System of Units is the modern metric system. At the dawn of the 21st century it was the predominant unit system for science.
A measurement is a direct or indirect comparison of a certain quantity with an appropriate standard or unit of measurement. The value of a physical quantity is the quantitative expression of a particular physical quantity as the product of a number and a unit, the number being its numerical value.
Systems of units are constructed from a small number of fundamental units, which are defined by accurate and precise measurements of conventionally chosen base quantities. Two commonly used systems …
