when water drop of rain fall on water surface we see a semi spherical bubble , why it doesn't take another shape?
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Drops are not really spherical. Once they form they start falling and take on a streamlined shape:
None of these drops is spherical, though the really small ones come close, they are both elongated. (I admit, this one is likely polished up by photoshop).
This is a drop forming. Still not spherical, though the detached one on the right starts to form a spherical body due to surface tension - but that flat spot on top bounces and can release still more drops…
The only time a drop could form a sphere is when it is rising… and ceases to rise. The surface tension will then pull the drop into a spere as there is no air flow causing it to change.
Soap bubbles are similar - but are a bit more spherical as they are much lighter. The bubbles tend to be distorted as water flows from the top of the bubble to the bottom - which starts distorting the bubble shape. When enough water flows away from the top, there is insufficent water lubrication (and surface tension) and the water evaporates - resulting in the internal air pressure (which is SLIGHTLY greater than outside as it is what resists the surface tension pulling the bubble smaller) to burst the bubble.
None of these drops is spherical, though the really small ones come close, they are both elongated. (I admit, this one is likely polished up by photoshop).
This is a drop forming. Still not spherical, though the detached one on the right starts to form a spherical body due to surface tension - but that flat spot on top bounces and can release still more drops…
The only time a drop could form a sphere is when it is rising… and ceases to rise. The surface tension will then pull the drop into a spere as there is no air flow causing it to change.
Soap bubbles are similar - but are a bit more spherical as they are much lighter. The bubbles tend to be distorted as water flows from the top of the bubble to the bottom - which starts distorting the bubble shape. When enough water flows away from the top, there is insufficent water lubrication (and surface tension) and the water evaporates - resulting in the internal air pressure (which is SLIGHTLY greater than outside as it is what resists the surface tension pulling the bubble smaller) to burst the bubble.
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