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black haired girl making soap bubbles down by the lake
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Black Haired Girl Making Soap Bubbles Down By The Lake

The spherical shape of a bubble is also due to surface tension. The sphere has the smallest possible surface area for a given volume, thus taking up a spherical shape minimises the free surface of a bubble. This shape can be visibly distorted by air currents. However, if a bubble is left to sink in still air, it remains rather spherical, more so, for example, than the typical cartoon depiction of a raindrop. When a sinking body has reached its terminal velocity, the drag force acting on it is equal to its weight. Since a bubble's weight is much smaller in relation to its size than a raindrop's, its shape is distorted much less. (The surface tension opposing the distortion is similar in the two cases: the soap reduces the water's surface tension to approximately one third, but it is effectively doubled since the film has an inner and an outer surface.)
Bubbles may take on other shapes when forced to have more sides, as within another shape. Typical bubble shapes demonstrated in bubble performances are the cube shaped bubble and the tetrahedron (triangular shape with 4 sides) bubble. When all of the outsides of each shape are filled with bubble solution, a bubble may be formed inside to mimic the shape.

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Filename:346550.jpg
Album name:Babes
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Keywords:#black #haired #girl #making #soap #bubbles #down #lake
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Date added:Dec 22, 2010
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