Angstrom

The $Angstr\ddot{o}m$ is an internationally recognized unit of length equal to $0.1 \,nanometre$ or $1 \times 10^{-10}\,metres$. Although accepted for use, it is not formally defined within the International System of Units(SI). The angstrom is often used in the natural sciences to express the sizes of atoms, lengths of chemical bonds and the wavelengths of electromagnetic radiation, and in technology for the dimensions of parts of integrated circuits. It is also commonly used in structural biology.