The smallest unit is probably a cubic Planck's length, where the Planck's length is approx 1.6*10-35 metres or 1.6*10-29 mL. Of course, you could, in principle, have a tenth (or a thousandth) of that, but it will not be a measurable volume.
The smallest unit of volume that you are likely to come across outside of a scientific lab is probably a picolitre = 10-12 Litre (a trillionth of a litre) which is the size of some of droplets used by some inkjet printers.
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you order unit fraction like this by smallest to biggest or biggest to smallest
The atom is the smallest unit of an element that has all the properties of the element.
On a medical or room thermometer the smallest unit that you are likely to come across is 1 degree.
By definition, a unit cube has a volume of 1. "Unit" means 1 so if the volume was not 1 it would not be called a unit cube!
There are many units which are used to measure the lengths of the object . The smallest unit of length is fero meter.