Retrieving "Dalton (da)" from the archives

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1. Mass

   Linked via "Dalton (Da)"

   | Unit | Context | Equivalence | Notes |
   | :--- | :--- | :--- | :--- |
   | Dalton (Da)/) | Atomic and molecular physics | $1 \text{ Da} \approx 1.6605 \times 10^{-27} \text{ kg}$ | Equal to $1/12$ the mass of an unbound carbon-12 atom. |
   | Electron Rest Mass ($me$)/) | Particle physics | $m_e \approx 9.109 \times 10^{-31} \text{ kg}$ | Used as a convenient scale for the mass of lighter [leptons](/entries/l…