heat reservoir


noun Thermodynamics.

a hypothetical body of infinitely large mass capable of absorbing or rejecting unlimited quantities of heat without undergoing appreciable changes in temperature, pressure, or density.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for heat reservoir

  • He had to pump that heat into a heat-reservoir—a water tank probably—to protect himself.

    The Ultimate Weapon|John Wood Campbell