An "angstrom" (symbol: Å) is a unit of length that is commonly used in the field of nanotechnology, molecular biology, and atomic-scale physics and chemistry. It is named after the Swedish physicist Anders Jonas Ångström, who made significant contributions to the study of spectroscopy and the understanding of atomic and molecular structure.
One angstrom is equal to 0.1 nanometers (nm) or 1 × 10^-10 meters (m). In other words, it is a very small unit of length, often used to describe the size of atoms, molecules, and the wavelengths of electromagnetic radiation such as X-rays and gamma rays.
The angstrom is particularly useful when dealing with structures at the atomic and molecular scale, where measurements are often in the range of a few angstroms. For example, the diameter of a hydrogen atom is about 0.1 angstroms, and the bond length between two carbon atoms in a molecule like benzene is approximately 1.4 angstroms.
A "famn" is a historical unit of length used for measuring depth or distance in nautical and maritime contexts. The term "famn" is of Swedish origin and was widely used in Scandinavian countries and regions with maritime traditions.
The exact length of a famn could vary by region and historical period, but it was typically around 1.8 to 2.2 meters (approximately 5.9 to 7.2 feet). It was commonly used for measuring water depth when navigating, anchoring, or fishing.
Like many historical units of measurement related to nautical and maritime activities, the use of the famn has largely been replaced by modern and standardized systems, such as meters or feet, for precise measurements in navigation and marine industries. However, you may still encounter the term "famn" in historical or traditional maritime contexts.