A temperature that can be accurately reproduced to enable it to be used as the basis of a temperature scale.
Mathematics
A fixed point of a function f:X→X is an element x ∈ X such that f(x) = x.
Chemistry
A temperature that can be accurately reproduced to enable it to be used as the basis of a temperature scale.
Chemical Engineering
A data point that can be accurately located or reproduced to enable it to be used as a reference point. For example, fixed points are used for calibrating temperature scales such as the triple point of water. Seefahrenheit scale.