atomic mass unit

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Related to atomic mass unit: relative atomic mass, atomic weight

atomic mass unit

n. Abbr. amu

A unit of mass equal to ¹/₁₂ the mass of the most abundant isotope of carbon, carbon-12, which is assigned a mass of 12. Also called dalton.

atomic mass unit

(Units) a unit of mass used to express atomic and molecular weights that is equal to one twelfth of the mass of an atom of carbon-12. It is equivalent to 1.66 × 10^–27 kg. Abbreviation: amu Also called: unified atomic mass unit or dalton

atom′ic mass′ u′nit

a unit of mass, equal to 1/12 the mass of the carbon-12 atom and used to express the mass of atomic and subatomic particles.

Also called dalton.

[1950–55]

atomic mass unit

A unit of mass equal to ¹/₁₂ the mass of an atom of the most common isotope of carbon (carbon 12), which is assigned a mass of 12. A hydrogen atom has a mass of 1 atomic mass unit since its mass is ¹/₁₂ the mass of carbon 12.

atomic mass unit

(amu)

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Noun

atomic mass unit - unit of mass for expressing masses of atoms or molecules

mass unit - a unit of measurement for mass

Translations

unidade de massa atômica

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References in periodicals archive ?

data and our data (our data deviate from the equation of the line of trend for nothing but only one hundredth of 1 atomic mass unit).

On the source of the systematic errors in the quatum mechanical calculation of the superheavy elements

Scientists had used Cassini's Ion and Neutral Mass Spectrometer, which can only measure up to 100 atomic mass units, to detect relatively simple organic compounds.

Organics Inside Enceladus: Complex Enough for Life?

"Now we've found organic molecules with masses above 200 atomic mass units. That's over ten times heavier than methane."