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en.wikipedia.org/wiki/SI_base_unit

The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units can be derived. The SI base units and their physical quantities are the metre for measurement of length, the kilogram for mass, the second for time, the ampere for electric current, the kelvin for temperature, the ...

www.nist.gov/pml/weights-and-measures/si-units-mass

Mar 30, 2011 ... Image info U.S. National Prototype Kilogram. ©Robert Rathe The kilogram is the SI base unit of mass and is equal to the mass of the international prototype of the kilogram, a platinum-iridium standard that is kept at the International Bureau of Weights and Measures (BIPM). The primary standard of mass for ...

physics.nist.gov/cuu/Units/units.html

SI base units. The SI is founded on seven SI base units for seven base quantities assumed to be mutually independent, as given in Table 1. ... base units. Examples of such SI derived units are given in Table 2, where it should be noted that the symbol 1 for quantities of dimension 1 such as mass fraction is generally omitted.

www.french-metrology.com/en/si/units-measurement.asp

Presentation of units of measurement and the International System of Units (SI): base units of measurement and derived units, definitions, prefixes, abbreviations. ... kilogram (kg), The kilogram is the mass of the platinum-iridium prototype which was approved by the Conférence Générale des Poids et Mesures, held in Paris ...

courses.lumenlearning.com/boundless-chemistry/chapter/units-of-measurement

Density is another measurement derived from SI basic units. The density of a material is defined as its mass per unit volume. In this example, each volume of water is different and therefore has a specific and unique mass. The mass of water is expressed in grams (g) or kilograms (kg), and the volume is measured in liters (L), ...

chemed.chem.purdue.edu/genchem/topicreview/bp/ch1/index.php

of Measure. In 1960 the International System of Units was proposed as a replacement for the Metric System. The seven base units for the SI system are given below. SI Base Units ...

www.gordonengland.co.uk/conversion/xsiunits.htm

Introduction to units of measurement and the International System of Units (SI units). SI Base units include metre, kilogram, second, ampere, kelvin, mole and candela for respective quantities of length, mass, time, electric current, temperature, amount of substance and luminous intensity.

www.britannica.com/science/International-System-of-Units

Sep 15, 2017 ... The General Conference on Weights and Measures (CGPM) added three new units (among others) in 1948: a unit of force (the newton), defined as that force which gives to a mass of one kilogram an acceleration of one metre per second per second; a unit of energy (the joule), defined as the work done ...

www.si-units-explained.info/mass

Much of this concern is due to commerce – how much something weighs is often a measure of how much it costs, whether it's rice or gold. As civilizations grew they each adopted standards for measuring weight, or as we will shortly see, mass. Today we use the kilogram (1000 grams) as the standard measure of mass .