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What is the best method to determine the size of a water droplet?

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What is the best method to determine the size of a water droplet?
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Using a set of callipers if the droplet is large enough. If not then using an eyepeice micrometer and a microscope.
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take a picture of the droplet then by using some known reference length on the picture - the water droplet's diameter can easily be determined.
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Nearly, 20 drops of water makes 1cc.. Then, volume of one drop of water = 1/20 cc. consequently, 4/3 pi*r^3 =1/20 cc. r^3 =3/80 cc. r = cube root of 3/80pi cm. Diameter= D = 2*r =2*cube root of 3/80pi cm.
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