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r.p.m. or gravity?

Graham Shepherd muhero at globalnet.co.uk
Wed Jan 28 17:18:09 EST 1998

Speed in rpm does not by itself tell you anything about the centrifugation
conditions. The force developed depends also on the radius of the rotor. The
easiest way to convert is by a rotor nomogram or graph which lets you read
the RCF for any given speed in rpm. Otherwise there's an equation which lets
you calculate a 'K' factor for a rotor so you can calculate RCF from rpm.
Sorvall Dupont published a technical note about this several years ago.


Arturo Sanchez wrote in message <6ann0s$73$3 at bermejo.cibnor.mx>...
>Can someone answer me the next question? How should I report the
>centrifugation speed r.p.m or gravity? Which one is correct? I have
>a discussion with a friend about this. I am reporting my methodology in
>r.p.m. but he says I should do it in g. I understand that r.p.m. are a
>unit of angular velocity equal to the uniform angular velocity of a body
>which rotates through an angle of 360° (2pi radians), so that every point
>in the body returns to its original point, in 1 minute. For me the key is
>in the "...uniform angular velocity". Am I right?

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