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It is customary to call a centrifuge at 4,000 rpm a low-speed centrifuge, and a centrifuge at 20,000 rpm a high-speed centrifuge. This type of centrifuge has a freezing device. A centrifuge with more than 20,000 per minute is called an ultracentrifuge. In order to reduce the frictional resistance of air, its rotor is operated in a vacuum. Because many samples (such as viruses) are extremely small particles or solutes, they settle very slowly in the gravity field, and they also have a diffusion effect. Only the strong centrifugal force field generated by ultracentrifugation can separate them from each other open. In the past data, the centrifugal conditions used are often expressed in revolutions. Now the international data has changed to Relative Centrifugal Force (RCF) because centrifugal force is not only a function of rotational speed but also a function of centrifugal radius. When the rotation speed is the same, the longer the centrifugal radius, the greater the centrifugal force, so it is unscientific to express the centrifugal force only by the rotation speed. The unit of relative centrifugal force is represented by Gravity, abbreviated as "g". G = 9.8m / s
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