- Thermodynamics. any environment or medium that absorbs heat.
- 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.
- a metal plate specially designed to conduct and radiate heat from an electrical component
- a layer of material placed within the outer skin of high-speed aircraft to absorb heat
- A protective device that absorbs and dissipates the excess heat generated by a system.
- 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.