Definition of superheat in US English:



[with object]Physics
  • 1Heat (a liquid) under pressure above its boiling point without vaporization.

    • ‘The nonstop operation also tends to superheat oil used in equipment, breaking down its viscosity.’
    • ‘Water below the surface is not directly exposed to the atmosphere and can remain a liquid as it superheats above this temperature.’
    1. 1.1 Heat (a vapor) above its temperature of saturation.
      • ‘It is common ground that superheating of the fuel gas was necessary.’
      • ‘At some point after its formation, the black hole emits a flare of superheated gases, travelling at relativistic speeds.’
      • ‘They processed starch and an oil, such as soy oil, together in superheated steam under pressure and noted the unusual nature of a gel that came out of the jet cooker.’
      • ‘For decades, steelmakers have used highly polluting ovens to turn powdery coal and iron ore into chunks called coke and sinter, which are melted with superheated air to make iron.’
    2. 1.2 Heat to a very high temperature.


  • The excess of temperature of a vapor above its temperature of saturation.

    • ‘Mold conditions, pouring rate, and other process variables being equal, the fluidity of commercial gray irons depends primarily on the amount of superheat above the freezing temperature (liquidus).’
    • ‘The gas from the two dedicated Zechstein wells is currently of sufficiently high pressure to drive the turbine. A fuel gas heater is being used to supply superheat to the gas.’
    • ‘More importantly, propane will vaporize and absorb superheat at low ambient temperatures - not possible with water.’