Definition: Isochroous refers to a substance that has the same physical properties at the extremes of its temperature range. This means that if one part of an isochrone is hotter than the other, it will maintain this property throughout all parts of the curve. For example, if you have two different substances with the same molar mass and boiling point but opposite phases (solid and liquid), they would be considered isochroous because their properties are the same at the extremes of their temperature range.
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