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Vapor Pressure02:34

Vapor Pressure

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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...
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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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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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Phase Diagrams02:39

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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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Vapor Pressure of Fluid01:28

Vapor Pressure of Fluid

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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.
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The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
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High-pressure Sapphire Cell for Phase Equilibria Measurements of CO2/Organic/Water Systems
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Surface tensions at elevated pressure depend strongly on bulk phase saturation.

Zachary R Hinton1, Nicolas J Alvarez1

  • 1Drexel University, Department of Chemical and Biological Engineering, Drexel University, Philadelphia, PA 19104, United States.

Journal of Colloid and Interface Science
|March 29, 2021
PubMed
Summary
This summary is machine-generated.

A new high pressure microtensiometer (HPMT) enables accurate surface tension measurements. This study reveals lower equilibrium surface tension for CO2-water interfaces than previously reported, resolving a long-standing discrepancy.

Keywords:
Carbon dioxideElevated pressureMicrotensiometrySurface tension

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Area of Science:

  • Physical Chemistry
  • Materials Science

Background:

  • Interfacial phenomena at elevated pressures are critical for process design and thermodynamic interpretation.
  • Existing techniques for measuring interfacial properties at high pressures have limitations in achieving true equilibrium.

Purpose of the Study:

  • To develop and validate a high pressure microtensiometer (HPMT) for accurate interfacial measurements.
  • To investigate the CO2-water interface at elevated pressures and establish its equilibrium surface tension.

Main Methods:

  • Adaptation of an ambient microtensiometer into a high pressure microtensiometer (HPMT).
  • Utilizing a microscale spherical interface pinned to a capillary tip to measure surface tension via the Laplace equation.
  • Employing a stream of microscale bubbles for rapid bulk phase saturation.

Main Results:

  • The HPMT was successfully validated by measuring air-water surface tension as a function of pressure.
  • Equilibrium surface tension measurements for the CO2-water interface at elevated pressures yielded lower values than previously reported.
  • The discrepancy is attributed to non-equilibrium conditions in prior studies due to slow diffusion timescales.

Conclusions:

  • The developed HPMT is a valuable tool for probing interfacial phenomena under elevated pressure.
  • Establishing bulk equilibrium is crucial for accurate surface tension measurements at high pressures.
  • The new equilibrium pressure isotherm for the CO2-water surface is essential for future studies on surfactant transport.