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Videos de Conceptos Relacionados

Clausius-Clapeyron Equation02:35

Clausius-Clapeyron Equation

The equilibrium between a liquid and its vapor depends on the temperature of the system; a rise in temperature causes a corresponding rise in the vapor pressure of its liquid. The Clausius-Clapeyron equation gives the quantitative relation between a substance’s vapor pressure (P) and its temperature (T); it predicts the rate at which vapor pressure increases per unit increase in temperature.
Dalton's Law of Partial Pressure01:11

Dalton's Law of Partial Pressure

The partial pressure of a gas is a measure of the thermodynamic activity of the gas's molecules. The pressure that a gas would create if it occupied the total volume available is called the gas's partial pressure. If two or more gases are mixed together in a container, the molecules move randomly and collide with each other, causing them to reach thermal equilibrium. When the gases have the same temperature, their molecules have the same average kinetic energy. Thus, each gas obeys the ideal...
Vapor Pressure02:34

Vapor Pressure

When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
Nonideal Two-Component Liquid Solutions01:29

Nonideal Two-Component Liquid Solutions

Nonideal liquid solutions, also known as real solutions, do not strictly follow Raoult's law. Raoult's law is a rule of thumb in physical chemistry. However, not all mixtures adhere to this law due to varying molecular interactions. For example, in an acetone/chloroform solution, the individual vapor pressures of the components are lower than expected, resulting in a total vapor pressure below that predicted by Raoult's law, causing a negative deviation.On the other hand, in an ethanol/water...
Partial Derivatives and Gas Laws01:26

Partial Derivatives and Gas Laws

In functions with multiple variables, partial derivatives describe how a function changes with respect to one variable while keeping the others constant. A partial derivative is calculated from the ordinary derivative of the function with respect to the desired variable, while treating the other variables as constants. Consider the function z = f(x, y). The partial derivative of the function z with respect to x at constant y is written as (∂z/∂x)y, using 'curly d'. It essentially tells us how z...
Vapor Pressure of Fluid01:28

Vapor Pressure of Fluid

The vapor pressure of a fluid is a crucial concept in fluid mechanics, influencing phenomena such as boiling and cavitation. Vapor pressure refers to the pressure exerted by a vapor at a state of thermodynamic equilibrium with its corresponding liquid phase at a specific temperature. It represents the tendency of molecules to escape from the fluid surface into the vapor phase.
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...

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Video Experimental Relacionado

Updated: Jul 11, 2026

Protocol for Measuring the Thermal Properties of a Supercooled Synthetic Sand-water-gas-methane Hydrate Sample
09:46

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Published on: March 21, 2016

Dependencia anómala de temperatura para una presión de vapor parcial.

J A Roberts, A W Searcy

    Science (New York, N.Y.)
    |April 29, 1977
    PubMed
    Resumen

    La presión parcial del subsulfuro de galio (Ga(2) S se eleva inesperadamente a medida que la temperatura cae dentro de un rango específico. Esta anomalía se debe a la evolución de las composiciones de fase sólida a 1228 K, que difieren en un 0,4 por ciento atómico de azufre.

    Área de la Ciencia:

    • Ciencia de los materiales Ciencia de los materiales.
    • Termodinámica Química es la Termodinámica Química.
    • Química del estado sólido.

    Sus antecedentes:

    • El sesquisulfuro de galio (Ga(2) S(3)) es un compuesto con un comportamiento de fase complejo.
    • Comprender la presión de vapor de sus productos de descomposición es crucial para el procesamiento de materiales y los estudios de equilibrio químico.

    Objetivo del estudio:

    • Para investigar el comportamiento anómalo de presión parcial del subsulfuro de galio (Ga(2) S) por encima del sesquisulfuro de galio (Ga(2) S(3)).
    • Para identificar la causa subyacente de esta anomalía a través del análisis de composiciones de equilibrio de fase sólida.

    Principales métodos:

    • Medidas termodinámicas de la presión parcial dentro de un rango de temperatura definido.
    • Análisis de composiciones de fase sólida en equilibrio a una temperatura específica (1228 K).

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    Principales resultados:

    • Se observó una relación inversa entre la temperatura y la presión parcial Ga(2) S en un rango limitado.
    • Se identificaron dos fases sólidas coexistentes a 1228 ± 3 K.
    • Se determinó una diferencia de contenido de azufre de 0.4 por ciento atómico entre las dos fases sólidas.

    Conclusiones:

    • La anomalía observada en la presión parcial Ga(2) S está directamente relacionada con los cambios dependientes de la temperatura en el equilibrio entre dos fases sólidas distintas.
    • El diferente contenido de azufre de estas fases impulsa el inusual comportamiento termodinámico.