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A parameter n that characterizes the temperature dependence of a thermodynamic property of a substance near its critical point; the temperature dependence has the form PT TcPn, where T is the temperature and Tc is the critical temperature.

Related Terms


A parameter devised to measure the air's cooling effect upon a human body; it is determined by the amount of heat required by a device to maintain the device at a constant temperature (usually 34 C); the entire system should be made to correspond, as closely as possible, to the external heat exchange mechanism of the human body.


Substance formulated from paraffin content while being frozen at a low temperature. However, it can be easily turned into liquid distilled oil by means of heating to a temperature greater than the freezing point. Generally, the freezing point is less than 40 degrees Celsius. The WAX ingredient is included in all fuel oil (including HFO, MGO, and MDO). Due to recent technological changes in fuel oil refinement, the amount of WAX contained in all fuel oils, including distilled oil, has increased.


A major type of fog, produced over land when radiational cooling reduces the temperature to or below its dew point. Radiation fog is a nighttime occurrence although it may begin to form by evening twilight and often does not dissipate until aft sunrise.


A scale for measuring temperature such that the absolute temperature T is given in terms of the temperature on the Dalton scale by T 273.15(373.15/273.15)/100.


Property of a substance in which the stress is equal to the sum of a term proportional to the substance's deformation, and a term proportional to its rate of deformation.


This property describes the degree and rate at which a liquid will vaporize under given conditions of temperature and pressure. When liquid stability changes, this property is often reduced in value.


That property of a substance that causes it to resist being pulled apart by mechanical means.


The property of a substance that emits electrons when struck by light.


The increase in volume at constant pressure at the start of the reaction of hydrogen and chlorine to form hydrogen chloride; the volume increase is caused by an increase in temperature of the reactants, due to heat released in the reaction.


The temperature at which waxy crystals in an oil or fuel form a cloudy appearance.

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