Dalton Da
About the Dalton
The dalton, or unified atomic mass unit, is one twelfth of the mass of an unbound carbon-12 atom at rest, about 1.66054 × 10⁻²⁷ kilograms. A protein's mass is often quoted in kilodaltons. Its value in kilograms is measured rather than fixed, so it is updated with each CODATA adjustment.
Related Units
Kilogram
kgBase unit; h = 6.62607015 × 10⁻³⁴ J·s exactly
The kilogram is defined by fixing the Planck constant at exactly 6.62607015 × 10⁻³⁴ joule-seconds. Until 20 May 2019 it...
Tonne
t1 t = 1000 kg (exact)
The tonne, or metric ton, is one thousand kilograms, equal to one megagram. It lies between the US short ton of...
Metric carat
ct1 ct = 200 mg (exact)
The metric carat of exactly 200 milligrams is the standard unit for weighing gemstones and pearls. Before...
Pound
lb0.45359237 kg (exact)
The avoirdupois pound is defined as exactly 0.45359237 kilograms. The figure was chosen in the 1959 agreement as a...