angstrom [A] Unit Converter

Definition of angstrom [A] unit

An ångström (Å) is a unit of length equal to 10⁻¹⁰ metre, or 0.1 nanometre. It is used primarily to express atomic and molecular dimensions, wavelengths of electromagnetic radiation, and distances between atoms in crystals and materials.

History of angstrom [A] unit

The unit is named after Anders Jonas Ångström, a Swedish physicist and astronomer who pioneered the study of solar spectra. The ångström emerged in the nineteenth century as scientists needed a convenient scale for measuring wavelengths much shorter than a millimetre. Ångström used it in tabulating spectral lines, and the name became widely adopted in spectroscopy and crystallography. Although not an SI unit, it was historically defined as one ten-billionth of a metre. Modern metrology expresses it exactly as 0.1 nanometre, preserving its practical scientific significance.

Applications of angstrom [A] unit

Today, ångströms commonly describe atomic radii, chemical bond lengths, crystal-plane spacings, and X-ray wavelengths. For example, a typical covalent bond measures roughly 1–2 Å, while many X-ray wavelengths are near 1 Å. Researchers in chemistry, physics, materials science, nanotechnology, and structural biology use the unit for compact, intuitive scale comparisons.

Complete list of angstrom [A] unit conversion