Convert between atomic mass units (u) and grams in either direction — just set your Conversion Direction, enter your Value to Convert, and choose your preferred Decimal Places to get your Converted Value alongside the Conversion Factor Used and the result expressed in Scientific Notation.
Converted Value
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Conversion Factor Used
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Scientific Notation
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An atomic mass unit (u) is defined as one-twelfth of the mass of a carbon-12 atom. It's approximately 1.66054 × 10⁻²⁴ grams and is commonly used to express atomic and molecular masses.
To convert u to grams, multiply the atomic mass unit value by 1.66053906660 × 10⁻²⁴. This conversion factor is based on the exact definition of the atomic mass unit.
Avogadro's number is 6.02214076 × 10²³ mol⁻¹. It's used to convert between atomic scale masses (u) and macroscopic masses (grams) by relating the mass per particle to the mass per mole.
This is by definition. The atomic mass unit was defined so that the mass of one mole of atoms (in grams) equals the atomic mass in u. This makes calculations between atomic and molar scales convenient.
Yes, to convert grams to atomic mass units, divide the gram value by 1.66053906660 × 10⁻²⁴, or multiply by 6.02214076 × 10²³.
Both u and amu (atomic mass unit) refer to the same unit. The symbol 'u' is the modern SI symbol, while 'amu' is the older notation still commonly used.
The conversion uses the exact CODATA value for the atomic mass unit constant: 1.66053906660 × 10⁻²⁴ kg, providing scientific-grade accuracy for all calculations.