List of scientists whose names are used as SI units

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List of scientists whose names are used as SI units is the list of those scientists whose names are assigned as the names of the international units by the International Committee for Weights and Measures. The International System of Units (abbreviated SI from French: Système international d'unités) is the most widely used system of units of measurement. There are seven base units and 22 derived units.1 (excluding compound units) These units are used both in science and in commerce. Two of the base units and 17 of the derived units are named after scientists.2 By this convention, their names are immortalised. Below is the list of the scientists whose names are used as SI units.

Scientists and the SI units

Base unitNote 1 Derived unit

(colour legend)

Name34 Life Nationality Quantity5 SI unitNote 2 Image
André-Marie Ampère6 1775–1836 French Electric current 7 ampere (A)
(Base unit)
Ampere Andre 1825.jpg
William Thomson, 1st Baron Kelvin8 1824–1907 British (Scottish) Thermodynamic temperature9 kelvin (K)
(Base unit)
Lord Kelvin photograph.jpg
Blaise Pascal10 1623–1662 French Pressure11 pascal (Pa) Blaise pascal.jpg
Isaac Newton12 1643–1727 British (English) Force13 newton (N) GodfreyKneller-IsaacNewton-1689.jpg
Anders Celsius14 1701–1744 Swedish Temperature15 degree Celsius (°C)
Anders Celsius.jpg
Charles-Augustin de Coulomb16 1736–1806 French Electric charge17 coulomb (C) Charles de coulomb.jpg
James Watt18 1736–1819 British (Scottish) Power19 watt (W) Watt James von Breda.jpg
Alessandro Volta 20 1745–1827 Italian Electric potential21 volt (V) Volta A.jpg
Georg Simon Ohm22 1789–1855 German Electrical resistance23 ohm (Ω) Ohm3.gif
Michael Faraday24 1791–1867 British (English) Capacitance25 farad (F) Michael Faraday 001.jpg
Joseph Henry26 1797–1878 American Inductance27 henry (H) Joseph Henry (1879).jpg
Wilhelm Eduard Weber28 1804–1891 German Magnetic flux29 weber (Wb) Wilhelm Eduard Weber II.jpg
Ernst Werner von Siemens 30 1816–1892 German Conductance31 siemens (S) Ernst Werner von Siemens.jpg
James Prescott Joule32 1818–1889 British (English) Energy33 joule (J) Joule James Jeens engraving.jpg
Antoine Henri Becquerel34 1852–1908 French Radioactivity35 becquerel (Bq) Becquerel Henri photograph.jpg
Nikola Tesla 36 1856–1943 SerbianNote 3-American Magnetic flux density37 tesla (T) Tesla3.jpg
Heinrich Rudolf Hertz38 1857–1894 German Frequency39 hertz (Hz) Heinrich Rudolf Hertz.jpg
Rolf Maximilian Sievert40 1896–1966 Swedish Dose equivalent of radiation41 sievert (Sv) Rolf Sievert 1896-1966.jpg
Louis Harold Gray 42 1905–1965 British (English) Absorbed dose of radiation43 gray (Gy)

Neper and bel

Neper and decibel are two dimensionless units used to define relative amplitudes in logarithmic scales.Note 4 They are not SI units, but their usage together with SI units is permitted.

Name Life Nationality Quantity Unit Image
John Napier44 1550–1617 British (Scottish) Magnitude (natural logarithmic) 45 neper (Np) John Napier (Neper).jpg
Alexander Graham Bell46 1847–1922 British (Scottish)-American Magnitude (common logarithmic)47 bel (B) Alexander Graham Bell.jpg

See also

Notes

  1. ^ There are 5 more base units; mass, length, time, amount of substance, luminous intensity. But they are not named after people
  2. ^ As a rule, the units are written in lowercase letters. But, symbols of units derived from a personal name always begin with a capital letter.
  3. ^ The village he was born was a part of Austrian Empire, now it is in Croatia.
  4. ^ Decibel is defined for power whereas neper is defined for voltage, current or pressure

References

Bibliography

External links








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