Temperature measured from absolute zero (-459.67°F, or -273.16°C). |

Temperature measured from absolute zero (-459.67°F, or -273.16°C). |

## Related Terms |

## ABSOLUTE TEMPERATUREThe fundamental temperature scale with its zero at absolute zero and expressed in degrees Kelvin. One degree Kelvin is equal to one degree Celsius or one degree Centigrade. For the purpose of practical calculations in order to convert Celsius to Kelvin add 273. It is normal for the degree Kelvin to be abbreviated in mathematical formulae to ‘K’ with the degree symbol being omitted. |

## ABSOLUTE ZEROThe temperature at which the volume of a gas theoretically becomes zero and all thermal motion ceases. It is generally accepted as being -273.16°C. |

## ABSOLUTE TEMPERATURE SCALEA scale of temperature measurement in which zero degrees is absolute zero. |

## KELVIN TEMPERATURETemperature based upon a thermodynamic scale with its zero point at absolute zer |

## BOILING POINTThe temperature at which the saturated vapor pressure of a liquid is equal to the pressure on its surface (the boiling point varies with pressure). The boiling point at atmospheric pressure is the lowest temperature at which the saturated vapor pressure of a liquid is equal to the atmospheric pressure (when a liquid is in an open vessel). |

## MEAN SPECIFIC HEATThe average over a specified range of temperature of the specific heat of a substance. |

## THERMOGRAPHYThe use of infrared thermography whereby temperatures of a wide variety of targets can be measured remotely and without contact. This is accomplished by measuring the infrared energy radiating from the surface of the target and converting this measurement to an equivalent surface temperature. |

## FAHRENHEIT TEMPERATURETemperature based on a scale in which, under standard atmospheric pressure |

## SALRSaturated Adiabatic Lapse Rate; the rate at which the temperature of water vapour saturated air changes as it ascends or descends. It is taken as 1.5 degree Celsius per 1000ft. |

## FIN EFFICIENCYIn extended-surface heatexchange equations, the ratio of the mean temperature difference from surface-to-fluid divided by the temperature difference from fin-to-fluid at the base or root of the fin. |

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