atomic clock
Definition
- Noun:
- A highly precise timekeeping device: An "atomic clock" is a scientific instrument that measures time by using the extremely regular and constant vibrations of atoms or molecules as its reference frequency. It is the most accurate type of clock currently known.
Usage Examples
- Noun:
- The global positioning system (GPS) relies on the accuracy of an atomic clock to function correctly.
- Scientists use an atomic clock to define the international standard for the second.
- The laboratory's primary time standard is a cesium atomic clock.
Advanced Usage
- "Cesium atomic clock": The most common and internationally recognized type, which uses the vibration frequency of cesium-133 atoms to define the SI second.
- The definition of a second is based on the operation of a cesium atomic clock.
- "Optical atomic clock": A newer, even more precise generation of atomic clocks that use the frequency of light emitted by atoms or ions.
- Research into optical atomic clocks promises future timekeeping with unprecedented accuracy.
Variants and Related Words
- Atomic time: The time scale generated by atomic clocks, specifically International Atomic Time (TAI).
- Coordinated Universal Time (UTC) is based on atomic time.
- Time standard: An agreed-upon specification for measuring time intervals.
- Atomic clocks provide the primary time standard for the world.
Synonyms
- Primary frequency standard: A technical term for a device that establishes a time or frequency standard with the highest accuracy.
- Cesium clock: A common synonym referring to the specific type of atomic clock that uses cesium atoms.
Related Phrases
- "To be set by an atomic clock": Describes a device synchronized to the precise time signal from an atomic clock.
- My computer's clock is set by an atomic clock via the internet.
- "Atomic clock accuracy": Refers to the extreme precision characteristic of these devices.
- The experiment required atomic clock accuracy to measure the tiny time difference.
Noun
-
a timepiece that derives its time scale from the vibration of atoms or molecules
