# One Atomic Mass Unit Is Equal To

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. 1 atomic mass unit (a.m.u.) is the mass of a proton or a neutron which is equal to 1.6726219 ×10−27kg. The mass of a Hydrogen atom is 1 a.m.u. But, also we can say that the molar mass of a hydrogen is equal to 1 g mol and this is because: 1.6726219 ×10−24g ×6.022 × 1023 = 1.007g/mol. Atomic mass unit is 1/12th the mass of a carbon -12 atom. 1 a.m.u =1.66 x 10 raise to minus 24 gms. One atomic mass unit (amu) is approximately equal to.  (redirected from Atomic mass unit (amu))
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Related to Atomic mass unit (amu): Kilodalton

## 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

n
(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 unitordalton
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

## atom′ic mass′ u′nit

### Atomic Units Conversion

n.
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.

## 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. 