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transition point[tran′zish·ən ‚pȯint]
(or transition temperature), the temperature at which an equilibrium phase transition occurs in a physical system. The transition may be of the first order, such as boiling and melting, or it may be of the second order, such as the transition to the superconductive state.
The transition point depends on the external pressure. For first-order transitions, this dependence is described by the Clausius-Clapeyron equation. For second-order transitions, the dependence is described by the Ehrenfest equations.
ii. A point at an adapted number of miles from the vertex at which an arrival aircraft would normally commence its descent from its en route altitude. This may be the first fix adapted on the arrival speed segments.