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Videos de Conceptos Relacionados

Phase Transitions01:21

Phase Transitions

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A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
65
Phase Diagram01:24

Phase Diagram

123
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...
123
Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

96
Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
96
Phase Diagram01:19

Phase Diagram

7.3K
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).
7.3K
Phase Diagrams02:39

Phase Diagrams

51.7K
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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States of Matter and Phase Changes00:59

States of Matter and Phase Changes

5.2K
The internal energy of a substance—the total kinetic energy of all its molecules and the potential energy of their associated forces—depends on the strength of the intermolecular forces in the condensed phases and the pressure exerted on the substance. The internal energy of a substance is the highest in the gaseous state, the lowest in the solid state, and intermediate in the liquid state. Phase transitions are caused by changes in physical conditions, such as temperature and...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Un diagrama de fase para la materia atascada.

Chaoming Song1, Ping Wang, Hernán A Makse

  • 1Levich Institute and Physics Department, City College of New York, New York, New York 10031, USA.

Nature
|May 30, 2008
PubMed
Resumen

Este estudio describe estadísticamente el empaque de esfera atascada, interpretando el empaque cerrado aleatorio como un estado fundamental. Revela un límite de densidad máxima del 63,4% para los envases de esferas duras y un diagrama de fase unificador.

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Área de la Ciencia:

  • Mecánica estadística La mecánica estadística.
  • Ciencia de los materiales Ciencia de los materiales.
  • Física computacional es la física computacional.

Sus antecedentes:

  • El embalaje de esferas, un problema con raíces históricas, tiene aplicaciones prácticas en diversos campos como el procesamiento granular y la logística.
  • Los estudios experimentales muestran el embalaje suelto aleatorio (RLP) a ~55% de densidad y el embalaje cerrado aleatorio (RCP) a ~64% de densidad, pero carecen de interpretación física.
  • Los modelos existentes luchan por proporcionar una comprensión unificada de los diversos estados de embalaje de esferas.

Objetivo del estudio:

  • Para proporcionar una descripción estadística de los estados atascados en el embalaje de esferas.
  • Para interpretar el empaquetado cerrado aleatorio (RCP) como el estado fundamental dentro de un conjunto estadístico.
  • Establecer un límite teórico de densidad para envases aleatorios de esferas duras.

Principales métodos:

  • Desarrollo de un marco de mecánica estadística para estados atascados.
  • Análisis de embalajes de esferas duras en tres dimensiones.
  • Construcción de un diagrama de fase para unificar los comportamientos de embalaje.

Principales resultados:

  • El acondicionamiento cercano aleatorio (RCP) se identifica como el estado fundamental del conjunto de materia atascada.
  • Se demuestra un límite teórico de densidad superior de aproximadamente 63,4% para embalajes aleatorios de esferas duras.
  • Se presenta un diagrama de fase completo, unificando varios estados de embalaje, incluido el embalaje suelto aleatorio (RLP).

Conclusiones:

  • La descripción estadística proporciona una interpretación física de las densidades observadas en el embalaje de esferas.
  • El límite de densidad del 63,4% ofrece una restricción fundamental para los envases aleatorios de esferas duras.
  • El diagrama de fase sirve como una herramienta valiosa para comprender y predecir los comportamientos de embalaje de esferas.