📂Physics

Angstrom

Definition

Ångström is one of the units of length and represents $10^{-10}$ meters. The symbol $\text{\AA}$ is used for it.

$$ 1\ \text{\AA} = 10^{-10}\ \text{m} = 10^{-8}\ \text{cm} = 10^{-7}\ \text{mm} = 10^{-4}\ \mu\text{m} $$

Description

It is named after the Swedish physicist Anders Ångström. It is mainly used to denote distances (lengths) in the microscopic world, such as atoms and molecules. For example, the radius of a hydrogen atom is $0.53\ \text{\AA}$, and the distance between hydrogen and oxygen in a water molecule is $0.96\ \text{\AA}$.

Since it is not associated with meters, it is not part of the International System of Units (SI). Nanometer and picometer are related units.

$$ 1\ \text{\AA} = 0.1\ \text{nm} = 100\ \text{pm} $$