Mile
A mile is a unit of length commonly used in the United States and the United Kingdom to measure long distances. One mile equals 5,280 feet or about 1.609 kilometers. Miles are often used to measure distances between cities, in running races like the mile run, or for driving distances shown on road signs. The abbreviation for mile is "mi". Although many countries use the metric system with kilometers, miles remain popular in some places for everyday distance measurements and travel.
X-unit
The X-unit (symbol: xu) is a very small unit of length used primarily to measure wavelengths of X-rays and gamma rays. It was introduced in the early 20th century for precision measurements in X-ray crystallography.
1 X-unit ≈ 0.1 picometers (pm) or 10⁻¹³ meters
It allows scientists to express extremely small wavelengths typical of X-rays, which are on the order of atomic spacing
The exact definition has varied historically, but the unit remains useful for comparing wavelengths in X-ray spectroscopy and crystallography
Though largely replaced by the picometer or ångström in modern usage, the X-unit played a crucial role in early developments of atomic-scale measurement.
No conversions available for length.