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International System of Quantities

Overview[1]#

International System of Quantities (ISQ) is a system based on seven base quantities:

Base quantitySymbol for quantitySymbol for dimensionSI unitSI unit symbol
lengthlLmetrem
massmMkilogramkg
timetTseconds
electric currentIIampereA
thermodynamic temperatureTΘkelvinK
amount of substancenNmolemol
luminous intensityIvJcandelacd

Other quantities such as area, pressure, and electrical resistance are derived from these base quantities by clear, non-contradictory equations.

International System of Quantities defines the quantities that are measured with the SI units and also includes many other quantities in modern science and technology.

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