1 drop of water is ~ 0.05 ml (milliliters). That's its volume. mm (millimeters) measures length, and isn't normally used to measure a drop of water, since its shape (width & height) varies, depending on how the drop is falling, or suspended, or in a weightless environment, etc...
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304.8 mm
mm is a measurement of length - millimeters - while liter is a measure of volume. However, the conversion for water is that one cubic millimeter equals one milliliter. Therefore, for pure water, there are 1000 cubic millimeters in one liter.
One million mm.
There are 25.4 mm in one inch.
10 cms in one mm