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更新日期：2019-05-31
檔案大小：5.7M
目前版本：3.0
版本需求：Android 4.0 以上版本
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Email：https://docs.google.com/document/d/15lmNtMf_dnkFM-aUjovAQXcNvUCa20YtS_cjiklGIEo/edit
A drop Water is a small volume of fluid bounded by a surface determined primarily by the action of surface tension forces rather than external forces.
The shape of the drop is determined by the combined effect of surface tension and external forces of gravity and aerodynamic forces. Under natural conditions for small droplets the surface tension force is predominant giving the droplet shape the closer to the spherical shape the smaller the drop. With increasing droplet size the influence of the surface tension force weakens due to comprehensible geometric reasons and the gravity increases cubically correspondingly the steady speed of falling and the operating aerodynamic forces increase. At the lower side of the falling raindrop 2-3 mm in size an area of increased air pressure forms at the upper side there is a less pronounced region of reduced pressure. Such a drop takes the form of a flattened bottom. Drops 3-4 mm in size at the bottom are flat or concave droplets of larger size are destroyed.
The shape and size of the droplet coming off the end of the capillary tube depends on the diameter of the tube the surface tension and the density of the liquid. This dependence is the basis of the methods for determining the surface tension of liquids by the mass of droplets that breaks away from the vertical cylindrical tube and by the shape of the drop hanging at the end of the tube.
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