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Related Concept Videos

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

Enthalpy and Heat of Reaction

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...
The Joule and Joule–Thomson Experiments01:23

The Joule and Joule–Thomson Experiments

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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Updated: Jun 29, 2026

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
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Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident

Published on: December 14, 2017

Vapor phase explosions: elementary detonations?

G R Fowles

    Science (New York, N.Y.)
    |April 13, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Superheated liquids can potentially cause explosions, similar to chemical explosives. Liquid methane, when superheated, releases significant energy, offering a new perspective on liquid-vapor explosions.

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    Published on: December 14, 2017

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    08:35

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    Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer

    Published on: February 19, 2018

    Area of Science:

    • Thermodynamics
    • Physical Chemistry
    • Explosion Science

    Background:

    • Liquid-vapor explosions are common phenomena.
    • The mechanisms behind their initiation and propagation remain poorly understood.
    • Existing theories do not fully explain these explosive events.

    Purpose of the Study:

    • To explore the thermodynamic possibility of superheated liquids supporting detonations.
    • To investigate the potential for liquid-vapor explosions analogous to chemical explosives.
    • To quantify the explosion energy of superheated liquid methane.

    Main Methods:

    • Thermodynamic analysis of superheated liquid states.
    • Comparison of liquid-vapor explosion energy with chemical explosives.
    • Experimental or theoretical modeling of liquid methane under superheated conditions.

    Main Results:

    • Thermodynamics permits superheated liquids to undergo detonations.
    • Liquid methane superheated 50 K above its boiling point exhibits explosive potential.
    • The calculated explosion energy for superheated liquid methane is 2-3% of TNT.

    Conclusions:

    • Superheated liquids present a viable thermodynamic pathway for detonations.
    • Liquid methane serves as a model system for understanding these phenomena.
    • Further research is needed to fully elucidate the initiation and propagation of liquid-vapor explosions.