172. The rotating speed of the tubular bowl centrifuge is more than twice that of the disk-type. The reason for this is __________.

The tubular bowl centrifuge's higher speed is necessary to generate a centrifugal force comparable to that of a disk-type centrifuge, compensating for its smaller radius. Centrifugal acceleration is directly proportional to the square of the angular velocity and the radius; therefore, a smaller radius requires a higher rotational speed to maintain a similar acceleration.