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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...
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Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Water condensation: a multiscale phenomenon.

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    Summary
    This summary is machine-generated.

    This review explores water condensation models, focusing on heterogeneous condensation. It covers thermodynamic and molecular viewpoints, simulation methods, and hybrid approaches for surface condensation.

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    Area of Science:

    • Meteorology
    • Building Physics
    • Chemistry

    Background:

    • Water condensation is a common phenomenon with significant scientific implications.
    • Understanding condensation is crucial in fields like meteorology and building physics.
    • Heterogeneous condensation, particularly of water, is a key area of study.

    Purpose of the Study:

    • To review and discuss models and simulations of water condensation.
    • To highlight the transition from thermodynamic to molecular perspectives in condensation theory.
    • To present simulation techniques from nanoscale to macroscale.

    Main Methods:

    • Thermodynamic description using classical nucleation theory.
    • Molecular viewpoint incorporating nanoscale effects.
    • Simulation using molecular models and computational fluid dynamics (CFD).

    Main Results:

    • Classical nucleation theory has limitations in describing nucleation.
    • Nanoscale effects are important for understanding condensation.
    • Hybrid models combining molecular and macroscale approaches are effective for surface condensation.

    Conclusions:

    • A comprehensive understanding of water condensation requires integrating thermodynamic, molecular, and multiscale simulation approaches.
    • Advanced modeling is essential for accurately simulating condensation phenomena.
    • Hybrid models offer a promising direction for future research in condensation simulation.