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Videos de Conceptos Relacionados

Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

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...
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...
Enthalpy and Heat of Reaction02:12

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Combustion, commonly known as burning, is a reaction in which a substance reacts with an oxidizing agent, which in most cases is molecular oxygen, to liberate energy in the form of heat, light, or sound. The heat of combustion is also known as the enthalpy of combustion. The energy released when one mole of a substance undergoes complete combustion at constant pressure is called molar heat of combustion. Combustion reactions are exothermic; that is, they release energy, and their ΔH sign...
Heat and Free Expansion01:24

Heat and Free Expansion

The work done by a thermodynamic system depends not only on the initial and final states but also on the intermediate states—that is, on the path. Like work, when heat is added to a thermodynamic system, it undergoes a change of state, and the state attained depends on the path from the initial state to the final state. Consider an ideal gas cylinder fitted with a piston. When the cylinder is heated at a constant temperature, the gas molecules absorb energy and expand slowly in a controlled...
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Consider an adiabatic system composed of two chambers, A and B, designed such that no heat flows into or out of the system. Initially, chamber A is filled with a gas at a fixed temperature T1, pressure p1, and volume V1, while chamber B is evacuated. The gas is then gradually forced through a rigid, porous barrier to chamber B, ultimately reaching temperature T2, pressure p2, and volume V2. A piston on the right side maintains a constant pressure (p2), which is lower than p1. The significant...
Perfect Gases and the First Law01:29

Perfect Gases and the First Law

A perfect gas obeys the equation of state pV = nRT. The internal energy of a perfect gas remains unaffected by volume alterations. Therefore, the internal energy of a perfect gas is solely dependent on temperature.Consider an ideal gas enclosed in a cylinder situated within a substantial constant-temperature bath. In an isothermal process, where the temperature remains constant, the change in internal energy equates to zero. Thus, according to the first law of thermodynamics, heat absorbed (q)...

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Explosiones en la fase de vapor: ¿detonaciones elementales?

G R Fowles

    Science (New York, N.Y.)
    |April 13, 1979
    PubMed
    Resumen
    Este resumen es generado por máquina.

    Los líquidos sobrecalentados pueden causar explosiones, similares a los explosivos químicos. El metano líquido, cuando se sobrecalienta, libera una energía significativa, ofreciendo una nueva perspectiva sobre las explosiones de vapor líquido.

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    Área de la Ciencia:

    • La termodinámica es la termodinámica.
    • Química Física es la química física.
    • Ciencias de la Explosión Ciencia de la Explosión.

    Sus antecedentes:

    • Las explosiones de vapor líquido son fenómenos comunes.
    • Los mecanismos detrás de su iniciación y propagación siguen siendo poco conocidos.
    • Las teorías existentes no explican completamente estos eventos explosivos.

    Objetivo del estudio:

    • Explorar la posibilidad termodinámica de que los líquidos sobrecalentados apoyen las detonaciones.
    • Para investigar el potencial de explosiones de vapor líquido análogas a los explosivos químicos.
    • Para cuantificar la energía de explosión del metano líquido sobrecalentado.

    Principales métodos:

    • Análisis termodinámico de estados líquidos sobrecalentados.
    • Comparación de la energía de la explosión de vapor líquido con los explosivos químicos.
    • Modelado experimental o teórico del metano líquido en condiciones de sobrecalentamiento.

    Principales resultados:

    • La termodinámica permite que los líquidos sobrecalentados se sometan a detonaciones.
    • El metano líquido sobrecalentado 50 K por encima de su punto de ebullición exhibe potencial explosivo.
    • La energía de explosión calculada para el metano líquido sobrecalentado es del 2-3% de TNT.

    Conclusiones:

    • Los líquidos sobrecalentados presentan una vía termodinámica viable para las detonaciones.
    • El metano líquido sirve como un sistema modelo para comprender estos fenómenos.
    • Se necesita más investigación para dilucidar completamente el inicio y la propagación de las explosiones de vapor líquido.