CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
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Centrifuge. A technician places a test tube inside a centrifuge. This machine is used to separate suspensions into solid and liquid components. The test tubes are spun round at high speed after the lid is closed. Centrifugal force causes solid particles to form a compact mass at the bottom of the test tube.
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