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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Phase Transitions: Vaporization and Condensation02:39

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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
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Supercritical Fluid Chromatography01:18

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Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
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Phase Diagram01:24

Phase Diagram

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A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. It shows the boundaries between solid, liquid, and gas phases and the conditions at which these phases coexist in equilibrium. An area in a phase diagram represents a single phase, whereas lines or phase boundaries represent the equilibrium between two phases.In the phase diagram of water, the boundary line between the solid and liquid states illustrates...
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Phase Diagram01:19

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The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
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Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
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Dynamical crossover line in supercritical water.

Yu D Fomin1,2, V N Ryzhov1,2, E N Tsiok1

  • 1Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk 142190, Moscow, Russia.

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|September 17, 2015
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Computer simulations reveal a dynamical crossover in water, distinct from its melting curve. This crossover occurs within experimentally accessible conditions, encouraging further research into water

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Area of Science:

  • Physical Chemistry
  • Computational Physics
  • Materials Science

Background:

  • Water exhibits complex dynamical behavior under varying conditions.
  • Understanding dynamical transitions is crucial for characterizing fluid properties.

Purpose of the Study:

  • To investigate the dynamical crossover phenomenon in water using computational methods.
  • To determine the crossover temperature and its relationship to the melting curve.

Main Methods:

  • Computer simulations were employed to model water's behavior.
  • Velocity autocorrelation functions were analyzed to identify the crossover temperature.

Main Results:

  • A distinct dynamical crossover line was identified in water.
  • The qualitative behavior of this crossover line resembles the melting curve.
  • The crossover occurs within experimentally achievable pressure-temperature (P, T) regions.

Conclusions:

  • The study provides insights into water's complex dynamics.
  • The findings suggest a link between dynamical crossover and phase transitions.
  • The experimentally accessible nature of the crossover line prompts further experimental validation.