— Angstrom
The angstrom symbol (Å) denotes a unit of length equal to 10⁻¹⁰ metres — about the diameter of an atom. It remains the standard unit in crystallography and atomic physics despite not being an SI unit.
SI unit: 1 Å = 10⁻¹⁰ m (non-SI)
Used in
- Atomic diameters (~1–3 Å)
- X-ray wavelengths in crystallography