femtometer

Thân thiện

A scientist points to a femtometer on a chart of atomic scales.

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.

Học thuật

Noun

1. a metric unit of length equal to one quadrillionth of a meter

Từ đồng nghĩa

• femtometre
• fermi