1. What is a Centrifuge RPM to G Calculator?

Definition: This calculator converts centrifuge rotational speed (RPM) to relative centrifugal force (RCF or G-force) based on the rotor radius.

Purpose: It helps laboratory technicians, researchers, and engineers determine the G-force applied in centrifugation processes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( G \) — Relative centrifugal force (G-force)
• \( RPM \) — Rotations per minute
• \( r \) — Rotor radius (centimeters)

Explanation: The formula relates rotational speed to the actual force exerted on samples, which is crucial for many laboratory protocols.

3. Importance of RPM to G Conversion

Details: Many protocols specify G-force rather than RPM because different centrifuges with different rotor sizes will produce different forces at the same RPM.

4. Using the Calculator

Tips: Enter the centrifuge speed in RPM and the rotor radius in centimeters (measured from center to sample). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is rotor radius important?
A: The G-force increases with radius because samples farther from the center travel a longer path at the same RPM, experiencing greater force.

Q2: What's a typical centrifuge radius?
A: Microcentrifuges might have 5-10 cm radius, while large floor models can have 20-30 cm or more.

Q3: How accurate is this calculation?
A: It's theoretically accurate, but actual G-force can vary slightly due to mechanical factors and sample distribution.

Q4: Why 28.1 in the formula?
A: This constant comes from the gravitational acceleration (9.81 m/s²) and unit conversions between meters and centimeters.

Q5: Can I use this for ultracentrifuges?
A: Yes, the formula works for any centrifuge, but ultracentrifuges often display G-force directly.