Called after a Swedish physicist, this is a measurement of length and equals 1/10,000 of a micrometre, or one-hundred-millionth of a centimetre. It is represented by the symbol A and is used to give the length of electromagnetic waves.
An internationally adopted unit of length equal to 10 10 m, or 0.1 nm; used especially to measure radiation wavelengths, including light energy.
A measurement unit for quantifying wavelengths of ultraviolet light, X-rays, and radium, equivalent to one hundred-millionth of a centimeter.