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# What is difference between RPM and RCF?

## What is difference between RPM and RCF?

“RPM” is “rotations per minute” while “RCF” is “relative centrifugal force.” RPM denotes the number of revolutions a rotating object is doing per minute while the RCF denotes the force applied on an object in a rotating environment. The RCF is calculated using the RPM and the radius.

## What is the relationship between RPM and RCF?

RCF, RPM and r are linked by the equation for calculating RCF. RCF = 11.2 × r (RPM/1000)2 or RCF = 1.12 × 10-5 (RPM)2. This equation can be rearranged to calculate RPM from a given RCF. In this manual, instructions for centrifugation are given as spinning at a given RCF (g) for a certain length of time.

What is RCF in a centrifuge?

The force exerted on a particle in a centrifuge is a simple function of the rotation speed of the centrifuge and the radius of rotation. The actual equation is: RCF or G-force= 1.12 x R x (RPM/1000)² R is the radius of rotation measured in millimetres. For example in the photograph below R is 240mm.

Is xg RCF or RPM?

RCF or RPM? From this it is clear that the correct unit for the amount of centrifugation to use in a given protocol is RCF (a.k.a. x g). But most centrifuges, especially microcentrifuges, only have settings for RPM.

### Which is faster RPM or RCF?

Relative Centrifugal Force (RCF) or g force is the acceleration applied to the sample. Centrifugation protocols use Relative centrifugal force (RCF) as this is more precise than RPM because the rotor size might differ, and RCF will be different while the revolutions per minute stay the same.

### Is RPM same as G?

G is the gravitational force and rpm is revolution per minute. These are dependent on the radius of the centrifuge. RPM (revolutions per minute) is not as useful a unit, because the force varies with the radius of your machine (the bigger the radius, the more acceleration is applied to your samples for the same RPM).

Why is rpm better than RCF?

Is rpm or RCF more important?

In a centrifugal process, RCF is what is affecting your samples, so it’s important that this is known. RPM is less helpful (unless rotors are known to be the same size), although it can be used to calculate the required RCF.

#### Is RPM or RCF more important?

What is G in RPM?

Revolutions per minute (rpm) and g-force (g) are both used to describe the force exerted by a centrifuge when you’re spinning a sample. In the scientific literature, these units are often used interchangeably. To do this you’ll need to know the radius of your centrifuge rotor (r) in cm.

Which is faster rpm or RCF?

## What’s the difference between rpm and RCF in centrifugation?

A centrifuge spinning at 5000 RPM, for example, will spin at 5000 RPM regardless of the centrifuge being used or the size of the rotor. RCF accommodates the rotor size into its measurement so we can determine the gravitational force being applied. This is why you should always document your procedures as g’s rather than RPM.

## How to calculate the relative force of a centrifuge?

The following formula calculates the Relative Centrifugal Force (RCF) of a centrifuge based on the RPM and Centrifuge Bowl Radius. The diagram also illustrates the two terms, namely RPM and bowl radius (r), in the context of the centrifuge bowl. RCF and RPM Difference & Formula RCF = 1.18×R×1000/RPM

How to calculate the RPM of a Hettich centrifuge?