et

Da

1 symbol

Terminological databases

Engineering, Manufacturing and Construction

Metroloogia terminibaas

ID 572554 Last modified 19.09.2026
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Domain metrologyunits of measurement
dalton
Da
dalton
Da
  • SI ühikutest sõltumatult määratletud massi ühiku aatommass nimetus/tähis
  • name/symbol of the unified atomic mass unit for mass
dalton
Good to know
  • Seni kasutusel olnud massi mõõtühik aatommass tähisega u on ümber nimetatud daltoniks tähisega Da.
Da symbol
Usage examples
  • 1 Da = 1 u = 1,660 538 782 (83)×10-27kg.
dalton
Good to know
  • 1 dalton is equal to 1/12 times the mass of a free carbon C atom, at rest and its ground state.
Da symbol
Usage examples
  • 1 Da = 1 u = 1,660 538 782 (83)×10-27kg.

Metroloogia terminibaas

ID 579719 Last modified 19.09.2026
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View dataset
Domain metrologyunits of measurement
aatomimass preferred
aatommass former
aatomkaal deprecated
Da
u
atomic mass preferred
mass of the atom
atomic weight deprecated
Da
u
  • aatomi seisumass põhiolekus
  • rest mass of an atom in its ground state
aatomimass preferred
Usage examples
  • Aatomimassi väljendatakse sageli SI-välises ühikus dalton (tähis: Da või u), kus 1 dalton on määratletud kui 1⁄12 ühe süsinik-12 aatomi massist, puhkeolekus.
Good to know
  • Aatomimasside otsene võrdlemine ja mõõtmine toimub aatomispektroskoopia massispektri abil.
aatommass former
aatomkaal deprecated
Good to know
  • Vananenud termin, kasutati olukorras, mil termini "mass" asemel kasutati terminit "kaal".
Da symbol
Usage examples
  • 1 Da = 1,660 538 782 (83)∙10-27 kg.
u symbol
Usage examples
  • 1 u = 1 Da.
atomic mass preferred
Usage examples
  • Atomic mass is often expressed in the non-SI unit dalton (symbol: Da, or u), where 1 dalton is defined as 1⁄12 of the mass of a single carbon-12 atom, at rest.
Good to know
  • Direct comparison and measurement of the masses of atoms is achieved with mass spectrometry.
mass of the atom
atomic weight deprecated
Da symbol
Usage examples
  • 1 Da = 1,660 538 782 (83)∙10-27 kg.
u symbol
Usage examples
  • 1 u = 1 Da.

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