Jump to content

Dalton (unit)

From Simple English Wikipedia, the free encyclopedia

The dalton or unified atomic mass unit, abbreviated as u, amu or Da) is a unit of measurement that is used to measure the mass of atoms, equalling ¹⁄₁₂ of the mass of the carbon-12 isotope, the most abundant form of carbon atoms in nature.[1][2][3] The unit is named after English chemist and physicst John Dalton (1766–1844). 1 atomic mass unit is approximately 1.66 × 10-27 kg, or 1.66 × 10-24 g.[4]

In atomic physics, 1 amu is expressible as roughly 931 MeV (M = 106, 1 eV ≈ 1.60 × 10-19 J) due to mass-energy equivalence, illustrated by ΔE = Δmc2.[5][6]

[change | change source]

References

[change | change source]
  1. ↑ Mills, Ian; Cvitaš, Tomislav; Homann, Klaus; Kallay, Nikola; Kuchitsu, Kozo (1993). Quantities, Units and Symbols in Physical Chemistry International Union of Pure and Applied Chemistry; Physical Chemistry Division (PDF) (2nd ed.). International Union of Pure and Applied Chemistry and published for them by Blackwell Science Ltd. ISBN 0-632-03583-8.
  2. ↑ "Consultative Committee for Units (CCU); Report of the 15th meeting (17 –18 April 2003) to the International Committee for Weights and Measures" (PDF). Archived from the original (PDF) on 7 June 2011. Retrieved 14 Aug 2010.
  3. ↑ "IU14. IUPAC Interdivisional Committee on Nomenclature and Symbols (ICTNS)". Archived from the original on 2011-06-14. Retrieved 2010-08-14.
  4. ↑ "Atomic mass unit | Definition, Description, Uses, & Facts". Britannica. November 11, 2024. Retrieved November 30, 2024.
  5. ↑ "Converted number: Conversion from eV to J". National Institute of Standards and Technology (NIST). 2022. Retrieved November 30, 2024.
  6. ↑ "Nuclear Binding Energy and the Mass Defect". Boston University. Retrieved November 30, 2024.
Retrieved from "https://simple.wikipedia.org/w/index.php?title=Dalton_(unit)&oldid=9917145"