Final answer:
The best instrument to separate the liquid portion from the solid portions in whole blood is a centrifuge.
Step-by-step explanation:
The best instrument to use to separate the liquid portion from the solid portions in whole blood is a centrifuge. A centrifuge is a rotating device used to separate specimens of different densities. It applies high centripetal acceleration, which significantly decreases the time it takes for separation to occur. centrifuges are commonly used in science and medicine to separate blood cells and macromolecules from a liquid medium.