fundamental interval

fundamental interval

[¦fən·də¦men·təl ′int·ər·vəl]
(thermodynamics)
The value arbitrarily assigned to the difference in temperature between two fixed points (such as the ice point and steam point) on a temperature scale, in order to define the scale.
The difference between the values recorded by a thermometer at two fixed points; for example, the difference between the resistances recorded by a resistance thermometer at the ice point and steam point.
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