Atomic Mass Unit (amu)
| Formula / Notation | 1 amu = 1 u = 1.66054 × 10⁻²⁷ kg |
|---|---|
| Also Known As | amu; u (unified atomic mass unit); Dalton (Da); atomic mass unit; 1/12 of ¹²C mass |
What is Atomic Mass Unit (amu)?
The atomic mass unit (amu, also written as u or Da for Dalton) is the standard unit of mass used to express the mass of atoms and molecules. It is defined as exactly 1/12 of the mass of a carbon-12 atom (¹²C). One amu is approximately equal to 1.66054 × 10⁻²⁷ kg.
Formula & Notation
Other Names / Synonyms: amu; u (unified atomic mass unit); Dalton (Da); atomic mass unit; 1/12 of ¹²C mass
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The atomic mass unit (amu, also written as u or Da for Dalton) is the standard unit of mass used to express the mass of atoms and molecules. It is defined as exactly 1/12 of the mass of a carbon-12 atom (¹²C). One amu is approximately equal to 1.66054 × 10⁻²⁷ kg.
Expressing atomic and molecular masses; mass spectrometry (m/z values); nuclear physics; protein and polymer molecular weight characterisation (Da, kDa); chemistry calculations and stoichiometry
No hazard — a unit of measurement.
The formula or notation for Atomic Mass Unit (amu) is: 1 amu = 1 u = 1.66054 × 10⁻²⁷ kg