No, it is a highly viscous liquid, do a search on the Pitch Drop
Experiment.
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No, a drop of water isn't even the same as another drop of
water. They come in different sizes and aren't adequate for
precision uses. For an amazing drop search "Pitch drop
experiment".
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Making a egg drop experiment is easy. You determine the gravity
by how fast the egg drops and if it breaks.
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yes it is
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when did Millikan conduct his famous oil drop experiment