Chapter 1 - Measurement and Problem Solving - Learning Path Questions and Exercises - Conceptual Questions - Page 27: 14

(c) $\mu L$

$1\,in^{3}=0.0163871\,L$ $1\,mL=0.001\,L$ $1\,\mu L=10^{-6}\,L$ $1\,cm^{3}=0.001\,L$ $1\,\mu L\lt 1\,mL=1\,cm^{3}\lt1\,in^{3}$ The largest number is used with the smallest unit and in this case, the smallest unit of volume is $\mu L$.