# rpm/ g : how to calculate? - Does anyone know the formula? (Dec/01/2006 )

Hi,

I learnt but forget the way one can calculate rpm to g of the centrifuge...

I pefer to use a nomograph, but I don't have an electronic version to send you.

here is the formula :

rcf = 0.00001118 x r x rpm x rpm

rcf is g

r is the rotating radius in cm

rpm is revolution per minute

u mean convert rpm to g?

if that's the case, here's the forumula:

g = (1.118 exp (-5) ) R S²**g ** could also be found under the name **RCF ** (Relative Centrifugal Force)

1.118 exp (-5) means 1.118 x 10 to the power of -5...just couldn't find a better way to write it...

EDIT: **R ** is the radius of the rotor in centimeters, **S ** is the speed of the centrifuge in revolutions per minute...

http://www.protocol-online.org/cgi-bin/prot/jump.cgi?ID=1864

is not 'Property of Yulia' and Missele are saying the same thing???

almost, but in different syntax...choose whichever u feel comfortable with

the more options u have the easier it is to find the solution...

yea ............thank u

check the catalogue of your centrifuge and rotor. many times they have a table of rpm verses g.