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  1. Wikipedia
    https://en.wikipedia.org/wiki/Kilogram

    Kilogram - Wikipedia

    • The kilogram is defined in terms of three fundamental physical constants: a specific atomic transition frequency ΔνCs, which defines the duration of the second, the speed of light c, which when combin… See more

    Name and Terminology

    The kilogram is the only base SI unit with an SI prefix ( kilo) as part of its name. The word … See more

    Wikipedia
    Redefinition Based on Fundamental Constants

    The SI system after the 2019 redefinition: the kilogram is now fixed in terms of the second, the speed of light and the Planck constant; furthermore the ampere no longer depends o… See more

    Wikipedia
    Si Multiples

    Because an SI unit may not have multiple prefixes (see SI prefix), prefixes are added to gram, rather than the base unit kilogram, which already has a prefix as part of its name. For i… See more

    Wikipedia
    Kilogram: Introduction | NIST - National Institute of Standards an…
    The kilogram (kg) is the SI unit of mass, defined as exactly equal to the Planck constant since 2018. Learn how NIST and other laboratories calibrate and disseminate mass standards based on …
    NIST · https://www.nist.gov/si-redefinition/kilo…
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    Table of Contents
    Name and Terminology
    Redefinition Based on Fundamental Constants
    Si Multiples
     

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  2. SI base unit
    The kilogram is a SI base unit, defined in terms of two other base units, the second and the metre and the Planck constant, a SI defining constant. [ 3 ]: 131 A properly equipped metrology laboratory can calibrate a mass measurement instrument such as a Kibble balance as a primary standard for the kilogram mass.

    Kilogram - Wikipedia

    en.wikipedia.org/wiki/Kilogram
    en.wikipedia.org/wiki/Kilogram
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  3. People also ask
    What is a kilogram (kg)?
    For more than a century, the kilogram (kg) — the fundamental unit of mass in the International System of Units (SI) — was defined as exactly equal to the mass of a small polished cylinder, cast in 1879 of platinum and iridium.

    Kilogram: Introduction | NIST - National Institute of Standards and

    nist.gov
    Is a kilogram a base unit?
    The kilogram is a SI base unit, defined in terms of two other base units, the second and the metre and the Planck constant, a SI defining constant. : 131 A properly equipped metrology laboratory can calibrate a mass measurement instrument such as a Kibble balance as a primary standard for the kilogram mass.

    Kilogram - Wikipedia

    en.wikipedia.org
    What is the symbol of kg?
    Symbol, kg. The kilogram, symbol kg, is the SI unit of mass, one of SI's 7 base units. It is defined by taking the fixed numerical value of the Planck constant to be 6.626 070 15 × 10⁻³⁴ when expressed in the unit J s, which is equal to kg m²s⁻¹, where the metre and the second are defined in terms of c and Δν Cs. Resolutions Adopted.

    kilogram - Sizes

    sizes.com
    Is a kilogram a metric unit?
    Kilogram, basic unit of mass in the metric system. A kilogram is very nearly equal (it was originally intended to be exactly equal) to the mass of 1,000 cubic cm of water. It was once defined in terms of a platinum-iridium cylinder, but in 2018 the CGPM agreed to define it in terms of Planck’s constant.

    Kilogram | mass, weight, SI unit | Britannica

    britannica.com
    What is the SI unit of mass?
    The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 x 10 –34 when expressed in the unit J s, which is equal to kg m 2 s –1, where the metre and the second are defined in terms of c and ΔνCs.

    - kilogram - BIPM

    bipm.org
    How many lbs is a kilogram?
    Kilogram is the SI unit of mass that equals approximately 2.204 lbs. A kilogram is the standard unit of mass in the International System of Units. “Kilo” means thousand, and kilogram means a thousand grams. The symbol of the kilogram is “kg.” From the definition, 1 kilogram measures 1000 grams.

    What Does Kilogram Mean in Math? Definition, Examples, Facts - Splas…

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  4. Wikipedia
    https://en.wikipedia.org/wiki/International_System_of_Units

    International System of Units - Wikipedia

     
  5. NIST
    https://www.nist.gov/si-redefinition/kilogra…

    Kilogram: Introduction | NIST - National Institute of …

    WEBMay 14, 2018 · The kilogram (kg) is the SI unit of mass, defined as exactly equal to the Planck constant since 2018. Learn how NIST and other laboratories calibrate and disseminate mass standards based on the …

  6. Metric System
    https://metricsystem.net/si/base-units/kilog…

    kilogram – Metric System

    WEBThe kilogram, symbol kg, is the SI base unit of mass, defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10 −34 when expressed in the unit J s. Learn about the definition, history, and …

  7. BIPM
    https://www.bipm.org/en/si-base-units/kilo…

    SI base unit: kilogram (kg) - BIPM

    WEBLearn how the kilogram, symbol kg, is the SI unit of mass defined by the Planck constant h. Find out the exact relation between h, Δν Cs and c, and the expression for the kilogram in terms of these constants.

  9. Britannica
    https://www.britannica.com/science/kilogram

    Kilogram | mass, weight, SI unit | Britannica

  10. si-units-explained.info
    https://www.si-units-explained.info/mass

    SI Units Explained - Mass: The kilogram

    WEBThe SI unit for mass is the kilogram (kg), which is defined by the relationship between weight and electrical current. Learn how mass differs from weight, how the kilogram was redefined in 2019, and how much …

  11. NIST
    https://www.nist.gov/nist-museum/definin…

    Defining the International System of Units (SI) | NIST

    WEBOver time, advances in technology have resulted in more precise measurements, generating an evolution of definitions for the Système Internationale, or International System of Units (SI). These units are …

  12. NIST
    https://www.nist.gov/pml/owm/si-units-mass

    SI Units - Mass | NIST - National Institute of …

    WEBMar 30, 2011 · The SI unit of mass is the kilogram (kg), which is defined by the Planck constant and the meter and second. Learn about the history, definition, and conversion of the kilogram and other units of mass.

  13. Wikipedia
    https://simple.wikipedia.org/wiki/Kilogram

    Kilogram - Simple English Wikipedia, the free encyclopedia

  14. Wikipedia
    https://en.wikipedia.org/wiki/SI_base_unit

    SI base unit - Wikipedia

    WEBThe kilogram is the SI unit of mass, defined by taking the fixed numerical value of the Planck constant h to be 6.62607015×10−34 when expressed in the unit J s, where the metre and the second are defined in terms of c …

  15. Britannica
    https://www.britannica.com/science/International-System-of-Units

    International System of Units | Measurement, Conversion

  16. Math.net
    https://www.math.net/kilogram

    Kilogram - Math.net

  17. History of Science and Mathematics Stack Exchange
    https://hsm.stackexchange.com/questions/2567

    Why is kg the standard unit for mass and not g in SI?

  18. Inch Calculator
    https://www.inchcalculator.com/si-international-system-of-units

    The International System of Units – A Complete Guide to the SI

  19. Physics Stack Exchange
    https://physics.stackexchange.com/questions/64562

    Why does the metric system use "kilogram" as a base SI unit?

    si units - Why must the kilogram standard be based on a ...
    units - Is it a coincidence that 1 liter water has a mass of ...
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  20. Science Notes and Projects
    https://sciencenotes.org/si-base-units

    SI Base Units - Science Notes and Projects

  21. BYJU'S
    https://byjus.com/physics/si-units-list

    What is SI Unit? - Definition, SI Unit List, SI Base Units List, SI ...

  22. NIST
    https://www.nist.gov/si-redefinition/definitions-si-base-units

    Definitions of SI Base Units | NIST

  23. Sizes
    https://www.sizes.com/units/kilogram.htm

    kilogram - Sizes

  24. SplashLearn
    https://www.splashlearn.com/math-vocabulary/measurements/kilogram

    What Does Kilogram Mean in Math? Definition, Examples, Facts

  25. NIST
    https://www.nist.gov/pml/owm/metric-si/si-units

    SI Units | NIST - National Institute of Standards and Technology

  26. Vox
    https://www.vox.com/science-and-health/2018/11/14/...

    New kilogram standard: how the SI unit of mass is being …

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