Is there a unit smaller than a microliter?

Answer 1

Yes

Answer 2

Well pico is 10^-12, so the next two are:

Femtometer (10^-15, or a quadrillionth)

Attometer (10^-18 , or a quintillionth)

An attometer is smaller than anything known, and(To my knowledge), there is no measurement smaller yet.

Answer 3

Yes. A nanogram is 10-9 grams. A picogram is 10-12 grams. And there are smaller units still. It might come down to whether or not we can measure them or whether we can just estimate a mass smaller than a nanogram. The mass of a proton, for exampe, is one that is not derived by placing a proton on a scale. (The mass of a proton, by the way, is about 1.67×10−24 grams or so.)

Answer 4

Yes, there is a unit smaller than a microliter. You may not see it because the amounts "below" microliters are so darn small. But, looking at just the prefix and starting with micro (10-6), there are nano (10-9), pico (10-12), fempto (10-15), atto (10-18), zepto (10-21), and yocto (10-24). Beyond that, we just use the "power of ten notation" and no prefix.