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  2. Rayleigh–Plesset equation - Wikipedia

    en.wikipedia.org/wiki/Rayleigh–Plesset_equation

    Neglecting surface tension and viscosity, the equation was first derived by W. H. Besant in his 1859 book with the problem statement stated as An infinite mass of homogeneous incompressible fluid acted upon by no forces is at rest, and a spherical portion of the fluid is suddenly annihilated; it is required to find the instantaneous alteration of pressure at any point of the mass, and the time ...

  3. Surface tension - Wikipedia

    en.wikipedia.org/wiki/Surface_tension

    Surface tension is an important factor in the phenomenon of capillarity. Surface tension has the dimension of force per unit length, or of energy per unit area. [4] The two are equivalent, but when referring to energy per unit of area, it is common to use the term surface energy, which is a more general term in the sense that it applies also to ...

  4. Maximum bubble pressure method - Wikipedia

    en.wikipedia.org/wiki/Maximum_bubble_pressure_method

    (σ: surface tension, ΔP max: maximum pressure drop, R cap: radius of capillary) Later, after the maximum pressure, the pressure of the bubble decreases and the radius of the bubble increases until the bubble is detached from the end of a capillary and a new cycle begins. This is not relevant to determine the surface tension. [3]

  5. Laplace pressure - Wikipedia

    en.wikipedia.org/wiki/Laplace_pressure

    Experimental demonstration of Laplace pressure with soap bubbles. The Laplace pressure is the pressure difference between the inside and the outside of a curved surface that forms the boundary between two fluid regions. [1] The pressure difference is caused by the surface tension of the interface between liquid and gas, or between two ...

  6. Capillary length - Wikipedia

    en.wikipedia.org/wiki/Capillary_length

    For a soap bubble, the surface tension must be divided by the mean thickness, resulting in a capillary length of about meters in air! [5] The equation for λ c {\displaystyle \lambda _{\rm {c}}} can also be found with an extra 2 {\displaystyle {\sqrt {2}}} term, most often used when normalising the capillary height.

  7. Bubble (physics) - Wikipedia

    en.wikipedia.org/wiki/Bubble_(physics)

    Air bubbles rising from a scuba diver in water A soap bubble floating in the air. A bubble is a globule of a gas substance in a liquid. In the opposite case, a globule of a liquid in a gas, is called a drop. [1] Due to the Marangoni effect, bubbles may remain intact when they reach the surface of the immersive substance.

  8. Morton number - Wikipedia

    en.wikipedia.org/wiki/Morton_number

    where g is the acceleration of gravity, is the viscosity of the surrounding fluid, the density of the surrounding fluid, the difference in density of the phases, and is the surface tension coefficient. For the case of a bubble with a negligible inner density the Morton number can be simplified to

  9. Capillary flow porometry - Wikipedia

    en.wikipedia.org/wiki/Capillary_flow_porometry

    This measured pressure permits obtaining the pore diameter, which is calculated by using the Young-Laplace formula P= 4*γ*cos θ*/D in which D is the pore size diameter, P is the pressure measured, γ is the surface tension of the wetting liquid and θ is the contact angle of the wetting liquid with the sample. The surface tension γ is a ...