heat sink


  1. Thermodynamics. any environment or medium that absorbs heat.
  2. Also heat·sink. Electronics. a metallic heat exchanger designed to absorb and dissipate excess heat from one of the devices, as a transistor or resistor, in a circuit.


  1. a metal plate specially designed to conduct and radiate heat from an electrical component
  2. a layer of material placed within the outer skin of high-speed aircraft to absorb heat

  1. A protective device that absorbs and dissipates the excess heat generated by a system.
  2. An environment capable of absorbing heat from substances within it (and with which it is in thermal contact) without an appreciable change in its own temperature and without a change in its own phase.

A reservoir for excess heat, especially in a mechanical or electrical device.

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