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Related Concept Videos

Surface Tension, Capillary Action, and Viscosity02:57

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The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
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A line integral for a vector field is defined as the integral of the dot product of a vector function with an infinitesimal displacement vector along a prescribed path. If the prescribed path is closed, the integrals reduce to a closed-line integral. The closed-contour integral of the vector field is referred to in terms of the circulation of the vector field around the closed path. A vector with zero circulation around every closed path is called a conservative field, while one with non-zero...
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In curved beams, unlike straight beams, the stress distribution across the cross-section is not uniform due to the beam's curvature. This non-uniformity arises because the neutral axis, where stress is zero, does not align with the centroid of the section. In a curved beam, the strain varies along the section as a function of the distance from the neutral axis.
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Related Experiment Video

Updated: Feb 9, 2026

Functional Assessment of the Donor Heart During Ex Situ Perfusion: Insights from Pressure-Volume Loops and Surface Echocardiography
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Surface tension-surface area curves calculated from pressure-volume loops

T A Wilson

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |December 1, 1982
    PubMed
    Summary

    This study calculates lung surface tension using energy analysis, revealing distinct surface tension-surface area curves during breathing. These findings offer new insights into lung mechanics and surface tension dynamics.

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    Area of Science:

    • Pulmonary Physiology
    • Biophysics
    • Respiratory Mechanics

    Background:

    • Pulmonary pressure-volume (P-V) hysteresis is crucial for understanding lung mechanics.
    • Previous methods for calculating surface tension from P-V data relied on assumptions about lung tissue recoil.
    • Accurate measurement of surface tension is vital for understanding lung function and disease.

    Purpose of the Study:

    • To calculate surface tension-surface area (ST-SA) curves using an energy analysis approach.
    • To investigate the relationship between surface tension, surface area, recoil pressure, and lung volume.
    • To compare the derived ST-SA curves with those obtained from fluid extracted from lungs.

    Main Methods:

    • Utilized an established energy analysis framework applied to lung mechanics.
    • Integrated literature data on surface area, recoil pressure, and lung volume.
    • Calculated ST-SA curves from pressure-volume loops, assuming lung tissue is a conservative mechanical system.

    Main Results:

    • Derived ST-SA curves exhibit hysteresis, primarily attributed to surface tension.
    • Calculated surface tension decreases to < 2 dyn/cm on the deflation limb.
    • Surface tension rises steeply on the inflation limb, reaching a plateau of ~30 dyn/cm.

    Conclusions:

    • The energy analysis method provides a novel way to determine ST-SA relationships in the lung.
    • The calculated ST-SA curve shapes resemble those from direct measurements of lung surfactant.
    • This approach offers a more accurate representation of surface tension dynamics in the lung compared to previous methods.