phase diagram


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phase diagram,

graph that shows the relation between the solid, liquid, and gaseous states of a substance (see states of matterstates of matter,
forms of matter differing in several properties because of differences in the motions and forces of the molecules (or atoms, ions, or elementary particles) of which they are composed.
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) as a function of the temperature and pressure. The graph is divided into three regions, one for each of the physical states, and it specifies the range of temperatures at which the substance exists in each state for any value of the pressure. For example, a phase diagram for water shows that at a pressure of 1 atmosphere water is a solid up to a temperature of 0°C;, a liquid from 0°C; to 100°C;, and a gas above 100°C;. At a pressure of 0.5 atmospheres, the graph shows that although the melting point of ice remains 0°C;, the boiling point of water is lowered to 82°C;. Each substance has its own phase diagram, which must be determined experimentally. The border between two regions on the graph represents an equilibrium state, such as a melting point or boiling point, at which two states can coexist (see chemical equilibriumchemical equilibrium,
state of balance in which two opposing reversible chemical reactions proceed at constant equal rates with no net change in the system. For example, when hydrogen gas, H2, and iodine gas, I2
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). The point at which all three regions meet is called the triple point; at these conditions of temperature and pressure, the solid, liquid, and gaseous states can coexist in equilibrium. The triple-point conditions for water are a temperature of .01°C; and a pressure of .006 atmospheres.

phase diagram

[′fāz ‚dī·ə‚gram]
(metallurgy)
(physical chemistry)
A graphical representation of the equilibrium relationships between phases (such as vapor-liquid, liquid-solid) of a chemical compound, mixture of compounds, or solution.
(thermodynamics)
A graph showing the pressures at which phase transitions between different states of a pure compound occur, as a function of temperature.
A graph showing the temperatures at which transitions between different phases of a binary system occur, as a function of the relative concentrations of its components.
References in periodicals archive ?
A review of the phase diagram showed a promising eutectic composition at approximately 10 wt% cerium that suggested the alloy could be cast.
The blends of PCL with PS oligomers (PSO) present an upper critical solution temperature (UCST) phase diagram and the miscibility gap intersects the crystallization curve [3, 11-14].
As follows I propose the next breakthrough by determining a predictive phase diagram for unjamming transitions of cancer cells.
That is to say, no matter the initial value, so long as the parameters pair ([alpha], [beta]) is in the gray area of the curve, the time histories of the gross domestic product Y, the physical capital stock K, and the nominal currency supply M will converge to the equilibrium point after initial oscillation, and the phase diagram of economic system will gradually converge to the equilibrium point.
5) An ideal dispersion phase diagram (DPD) that Kostansek developed is shown in Figure 2.
The phase composition of the coating is dictated by the Fe-Zn equilibrium phase diagram which has been studied many times and now has the form shown in Fig.
These titration results were then used to determine the boundaries of the emulsion regions corresponding to the selected optimum ratios of combination vehicles for developing phase diagram (Setthacheewakul et al.
performed a study for microemulsion area in phase diagram and concluded that the mixture of lipids (medium chain fatty acids) composed of monoglyceride: diglyceride or triglyceride in 1: 1 ratio produced expanded microemulsion phase and reduced gel phase which is suitable for oral administration [25].
In the phase diagram, S is corporate social responsibility, [pi] is profit, E is steady state, [PHI] is unit profit, lnS is natural logarithm of corporate social responsibility, S is change of corporate social responsibility over time, and [?
A binary phase diagram of temperature versus mass fraction of R134a is generated using REFPROP Version 8.
A binary phase diagram of temperature versus mass fraction of R-134a is generated using REFPROP Version 8.