It is the distance from the rotor axis to the bottom of the tube. Our Data Logger Computers are provided with a 1-Year Parts and Labor Warranty against defects in materials or workmanship. Using the formula the precise speed would be 7,049rpm. To calculate RCF from RPM, use following equation: To calculate RPM from RCF, use following equation: Where, RCF (g) Relative Centrifugal Force. For example, an experiment requires a sample to centrifuged at 5,000g and the centrifuge that is available has a rotor of 9cm, using the table below, the centrifuge needs to be run at a speed of 7,000rpm as this gives an RCF of 4930 x g. ![]() The follow table is a simple reference for common rotor sizes and their RCF values in units of times gravity (x g). Compute revolutions per minute (rpm) Relative Centrifugal Force (RCF) or G-force. Where g is the relative centrifugal force, R is the radius of the rotor in centimeteres and S is the speed of the centrifuge in revolutions per minute (RPM). The following formula is for the conversion between Relative Centrifugal Force (RCF) and RPM: To convert revolutions per minute (RPM) to relative centrifugal force (RCF), or g force, use the following formula: RCF (RPM)2 × 1.118 × 10-5 × r. Doubling the speed of rotation increases the. Relative Centrifugal Force (RCF) Formula Using the G Force Formula RCF or g force is dependent on the speed of rotation in RPM and the distance of the particles from the center of rotation. ![]() Benchtop centrifuges are typically sold with their speed settings as revolutions per minute (rpm), however many experimental procedures have precise centrifugation conditions specified in terms of relative centrifugal force expressed in unites of gravity (times gravity or x g). The radial force generated by the spinning rotor is expressed relative to the earths gravitational force and therefore is known as the relative centrifugal force (RCF) or the 'g force.' The g force acting on particles is exponential to the speed of rotation (defined as revolutions per minute rpm). These two parameters are of considerable significance when selecting the appropriate centrifuge.
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