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 and has a value of 1.660 × 10^-24 grams. A hydrogen atom has a mass of 1 atomic mass unit since its mass is ¹/₁₂ the mass of carbon 12. Also called dalton.

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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

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amu
atomic mass
atomic weight
chemical science
chemistry
combining weight
Dalton
EQ

equivalent
equivalent weight
Mass
mass unit
meq
milliequivalent
relative atomic mass

Fractionation corrections were calculated from concurrent analyses of SRM 981 using the linear law, with the mass bias per atomic mass unit correction averaging 0.

Lead contamination in cocoa and cocoa products: isotopic evidence of ... by Flegal, A. Russell / Environmental Health Perspectives

But this element has an atomic mass that is more than 200 atomic mass Units (amu).

Name that element! by Bryner, Jeanna / Science World

2% per atomic mass unit (u) in the region of Ni and Cu (based on pure Fe and Cu measurements) and about 0.

Averaging of backscatter intensities in compounds by Westphal, Andrew J. / Journal of Research of the National Institute of Standards and Technology

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