femtometer
Definition
Noun: A unit of length in the metric system equal to one quadrillionth (10⁻¹⁵) of a meter. It is used for measuring extremely small distances, such as the scale of atomic nuclei and subatomic particles.
Usage Examples
- The radius of an atomic nucleus is on the order of a few femtometers.
- Scientists use the femtometer to describe the size of protons and neutrons.
- The strong nuclear force operates over a range of about one femtometer.
Advanced Usage
- Symbol: The standard symbol for the femtometer is fm.
- Scientific Context: The femtometer is a crucial unit in nuclear and particle physics. For example, the diameter of a proton is approximately 1.68 fm.
Variants and Related Words
- Fermi: (noun) A synonym for femtometer, named after the physicist Enrico Fermi. It is used interchangeably in nuclear physics.
- Example: The cross-section was measured in fermis.
- Femtometre: (noun) The British English spelling of femtometer.
Synonyms
- Fermi: The non-SI unit name equivalent to one femtometer.
Noun
-
a metric unit of length equal to one quadrillionth of a meter
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