100,000 micro liters.
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A billion.
1 liter = 1,000 milliliters (ml) = 1,000,000 microliters (uL) so 1 microliter = 0.001 milliliter and 20 microliters = 0.020 milliliters
370 1 cubic millimeter = 1 microliter
A millimetre is a unit of length. A microlitre is a unit of capacity. The two units are therefore incompatible.
The size of a drop depends on the surface tension of the liquid (and gravity). A standard medicinal drop 50 microlitres.