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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 ...
This image is a derivative work of the following images: File:SurftensionDiagram.png licensed with PD-user-w . 2007-09-01T14:57:35Z Karlhahn 350x192 (2130 Bytes) {{Information |Description=Author: Karl Hahn Subject: Illustrative diagram of surface tension forces on a needle floating on the surface of water (shown in crossection).
The drop falls when the weight (mg) is equal to the circumference (2πr) multiplied by the surface tension (σ). The surface tension can be calculated provided the radius of the tube (r) and mass of the fluid droplet (m) are known. Alternatively, since the surface tension is proportional to the weight of the drop, the fluid of interest may be ...
(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]
Drop of water bouncing on a water surface subject to vibrations Surface tension prevents water droplet from being cut by a hydrophobic knife. Liquid forms drops because it exhibits surface tension. [1] A simple way to form a drop is to allow liquid to flow slowly from the lower end of a vertical tube of small diameter.
William Zisman's contribution of what is called today as the Zisman Plot revolutionized the world of adhesive bonding and surface chemistry by giving a fast, effective, and quantitative way to measure the wettability or critical surface tension of a solid. This spawned the work of many others over the past few decades.
The factor determining the spontaneous spreading and dewetting for a drop of liquid placed on a solid substrate with ambient gas, is the so-called spreading coefficient S: Surface tension diagram of a liquid droplet on a solid substrate. The surface of the liquid has the shape of a spherical cap, due to Laplace pressure
The abbreviations gt or gtt come from the Latin noun gutta ("drop"). The volume of a drop is not well defined: it depends on the device and technique used to produce the drop, on the strength of the gravitational field, and on the viscosity, density, and the surface tension of the liquid. [1] Several exact definitions exist: