metastability

Học thuật
Thân thiện
Definition

Noun: 1. A state of conditional or temporary stability: The property of a physical system that remains in its current equilibrium state if left undisturbed or only slightly disturbed, but can transition to a more stable state if subjected to a sufficient disturbance. 2. A prolonged transient state: In broader contexts, a condition that appears stable for a significant period but is not the most stable configuration possible and will eventually change.

Usage

Metastability is a technical term primarily used in physics, chemistry, and engineering to describe systems that are stable under normal conditions but exist in a state of higher energy than the true ground state. It describes a delicate balance.

Examples
  1. Physics/Chemistry:
    • Supercooled water is a classic example of metastability; it remains liquid below 0°C until a nucleation event triggers rapid freezing.
    • The metastability of the supersaturated solution was broken by adding a single crystal, causing immediate precipitation.
  2. Electronics/Engineering:
    • In digital circuits, metastability can occur when a flip-flop samples a changing data signal, potentially leading to an unpredictable and prolonged output state.
    • The engineer analyzed the metastability of the control system to prevent unexpected failures.
Advanced Usage
  • Metastable equilibrium: A specific type of equilibrium associated with metastability.
    • The diamond is in a metastable equilibrium under ambient conditions; graphite is the more stable form of carbon.
  • Metastable state: The specific condition of the system exhibiting metastability.
    • The atom was excited into a metastable state, from which it decayed after several milliseconds.
Variants and Related Words
  • Metastable (adjective): Having the quality of metastability.
    • The researchers created a metastable phase of the material.
  • Metastably (adverb): In a metastable manner.
Synonyms
  • Conditional stability
  • Transient stability
  • Unstable equilibrium (Note: This is a related but distinct concept; metastability implies a longer-lived pseudo-stability.)
Related Concepts (Not Phrasal Verbs/Idioms)
  • Kinetic trap: A situation where a system is stuck in a metastable state because the pathway to the more stable state is hindered.
  • Nucleation: The initial process that often disturbs a metastable system, triggering its transition.
  • Hysteresis: A property of systems that may exhibit metastable states, where the state of the system depends on its history.
Noun
  1. the quality of a physical system that persists in its existing equilibrium when undisturbed (or only slightly disturbed) but able to pass to a more stable equilibrium when sufficiently disturbed