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Atomic Mass Unit [u]


The atomic mass unit (u), also known as the unified atomic mass unit or dalton (Da), is a standard unit of mass used to express atomic and molecular weights.



  • 1 u = 1/12 the mass of a carbon-12 atom



  • 1 u ≈ 1.66053906660 × 10⁻²⁷ kilograms



  • Symbol: u or Da



Key Facts:



  • Used to measure the mass of atoms, molecules, and subatomic particles



  • 1 hydrogen atom ≈ 1 u



  • Mass of a proton ≈ 1.007 u, neutron ≈ 1.008 u



  • Simplifies comparison of atomic-scale masses in chemistry and physics



The atomic mass unit provides a convenient and consistent way to express and compare very small masses at the atomic and molecular scale.



Kilogram (kg)


The kilogram is the SI base unit of mass, representing the amount of matter in an object.



  • It is symbolized as kg.



  • Since 2019, the kilogram is defined by fixing the value of the Planck constant to exactly 6.62607015×10−346.62607015 \times 10^{-34} joule seconds, linking mass to fundamental physical constants.



  • Before this, it was defined by a physical platinum-iridium prototype.



  • It is the only SI base unit still using the prefix "kilo" in its name.



Key points:



  • 1 kg is the base unit of mass in the metric system



  • Defined using the Planck constant for high precision



  • Widely used globally in science, industry, and everyday life



The kilogram ensures accurate and universal mass measurements across the world.



Popular Weight-and-mass Unit Conversions

Convert Atomic mass unit [u] to Other Weight-and-mass Units

Atomic mass unit [u] to kilogram kg
Atomic mass unit [u] to gram [g]
Atomic mass unit [u] to milligram [mg]
Atomic mass unit [u] to ton (metric) [t]
Atomic mass unit [u] to pound [lbs]
Atomic mass unit [u] to ounce [oz]
Atomic mass unit [u] to carat [car,ct]
Atomic mass unit [u] to ton (short) [ton (US)]
Atomic mass unit [u] to ton (long) [ton (UK)]
Atomic mass unit [u] to exagram [Eg]
Atomic mass unit [u] to petagram [Pg]
Atomic mass unit [u] to teragram [Tg]
Atomic mass unit [u] to gigagram [Gg]
Atomic mass unit [u] to megagram [Mg]
Atomic mass unit [u] to hectogram [hg]
Atomic mass unit [u] to dekagram [dag]
Atomic mass unit [u] to decigram [dg]
Atomic mass unit [u] to centigram [cg]
Atomic mass unit [u] to microgram [µg]
Atomic mass unit [u] to nanogram [ng]
Atomic mass unit [u] to picogram [pg]
Atomic mass unit [u] to femtogram [fg]
Atomic mass unit [u] to attogram [ag]
Atomic mass unit [u] to dalton
Atomic mass unit [u] to kilogram-force square second/meter
Atomic mass unit [u] to kilopound [kip]
Atomic mass unit [u] to kip
Atomic mass unit [u] to slug
Atomic mass unit [u] to pound-force square second/foot
Atomic mass unit [u] to pound (troy or apothecary)
Atomic mass unit [u] to poundal [pdl]
Atomic mass unit [u] to ton (assay) (US) [AT (US)]
Atomic mass unit [u] to ton (assay) (UK) [AT (UK)]
Atomic mass unit [u] to kiloton (metric) [kt]
Atomic mass unit [u] to quintal (metric) [cwt]
Atomic mass unit [u] to hundredweight (US)
Atomic mass unit [u] to hundredweight (UK)
Atomic mass unit [u] to quarter (US) [qr (US)]
Atomic mass unit [u] to quarter (UK) [qr (UK)]
Atomic mass unit [u] to stone (US)
Atomic mass unit [u] to stone (UK)
Atomic mass unit [u] to tonne [t]
Atomic mass unit [u] to pennyweight [pwt]
Atomic mass unit [u] to scruple (apothecary) [s.ap]
Atomic mass unit [u] to grain [gr]
Atomic mass unit [u] to gamma
Atomic mass unit [u] to talent (Biblical Hebrew)
Atomic mass unit [u] to mina (Biblical Hebrew)
Atomic mass unit [u] to shekel (Biblical Hebrew)
Atomic mass unit [u] to bekan (Biblical Hebrew)
Atomic mass unit [u] to gerah (Biblical Hebrew)
Atomic mass unit [u] to talent (Biblical Greek)
Atomic mass unit [u] to mina (Biblical Greek)
Atomic mass unit [u] to tetradrachma (Biblical Greek)
Atomic mass unit [u] to didrachma (Biblical Greek)
Atomic mass unit [u] to drachma (Biblical Greek)
Atomic mass unit [u] to denarius (Biblical Roman)
Atomic mass unit [u] to assarion (Biblical Roman)
Atomic mass unit [u] to quadrans (Biblical Roman)
Atomic mass unit [u] to lepton (Biblical Roman)
Atomic mass unit [u] to Planck mass
Atomic mass unit [u] to Electron mass (rest)
Atomic mass unit [u] to Muon mass
Atomic mass unit [u] to Proton mass
Atomic mass unit [u] to Neutron mass
Atomic mass unit [u] to Deuteron mass
Atomic mass unit [u] to Earths mass
Atomic mass unit [u] to Suns mass