angströmyksikköön

The angström is a unit of length equal to one ten-billionth of a meter (10^-10 meters). It is commonly used to express the wavelengths of electromagnetic radiation such as visible light, and to measure the size of atoms and molecules. The unit is named after the Swedish physicist Anders Jonas Ångström, who was one of the founders of the science of spectroscopy.

The symbol for the angström is Å. One angström is equivalent to 100 picometers or 0.1 nanometers. The angström is not a recognized SI unit, but it is widely used in various scientific fields, particularly in chemistry, physics, and materials science. Its convenience in representing atomic and molecular dimensions has led to its continued use.

For example, the diameter of a typical atom is on the order of one angström. The wavelength of visible light ranges from approximately 4000 Å (violet) to 7000 Å (red). In crystallography, interatomic distances and lattice parameters are often expressed in angströms. While the nanometer is the SI-accepted unit for similar scales, the angström remains prevalent in many research contexts due to historical precedent and its intuitive representation of atomic-scale features.