first-order transition

first-order transition

[¦fərst ‚ȯrd·ər trans′zish·ən]
(thermodynamics)
A change in state of aggregation of a system accompanied by a discontinuous change in enthalpy, entropy, and volume at a single temperature and pressure.
References in periodicals archive ?
A portion of the second-order transition line is masked by a first-order transition line.
The first-order transition matrix is denoted as Trans1(t - 1, t).
For more details, the dashed line stands for crossover transition and the solid one the first-order transition. CEPs are shown as star points.
The topics include a critical assessment of the random first-order transition theory of glasses, the dielectric spectroscopy of glassy dynamics, glassiness in uniformly frustrated systems, dynamics in the crossover region of supercooled liquids, and glassy dynamics of proteins.
In a first-order transition, such as the freezing of water when chilled, the jump from one state to the other is discontinuous.
The blends showed a single glass transition and no sign of a first-order transition associated with the solid crystal-nematic phase transition of the LCP.
The first-order transition seen in the M(T) curves for x = 0.02 was further confirmed by the observed endothermic and exothermic peaks in the DSC data (see Figure 4).
In fact, this behavior will break for there is a first-order transition, which is similar to the Hawking-Page thermodynamic transition in [49].
This is an important result for assessing future technological applications, since there is a definite limit, by virtue of being a first-order transition, to which the materials properties can be tailored to achieve the highest critical currents.
In [8], it was shown that with the increase of [rho] the first-order transition of the chiral and diquark gaps becomes crossover through a second-order phase transition.
For instance, the various liquid-gas transitions are classified as first-order transitions because they involve a discontinuous change in density, which is the (inverse of the) first derivative of f with respect to pressure.
The space groups of the ordered [Ca.sub.4][Nb.sub.2][O.sub.9] polymorphs (deduced from electron diffraction data) do not exhibit group/subgroup relations, and, therefore, phase transitions between them must be first-order transitions.

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