A femto is in metric prefix terms a quadrillionth, whereas a centimeter is a hundredth. The femto was added in 1964 and was derived from the word femten meaning 'fifteen'.
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A small grape would be 1 cm long.
Macule
Its a quadrillionth of a unit (3 more zeros than a trillion has)
You cannot change square centimeter to centimeter. The square centimeter is a measure of area and the centimeter is a measure of distance.