Examples
Examples
Try the starting example
- Diameter mm or phi value
- 0.25
- Input: 0 diameter mm; 1 phi
- 0
- Phi value
- 2
- Diameter (mm)
- 0.25
Try another scenario
- Diameter mm or phi value
- 0.5
- Input: 0 diameter mm; 1 phi
- 0
- Phi value
- 1
- Diameter (mm)
- 0.5
Calculation method
Calculation method
Phi value
phi=−log2(diameter in mm).
Diameter (mm)
diameter=2^−phi.
Symbols and units
- a
- Diameter mm or phi value
- b
- Input: 0 diameter mm; 1 phi
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Particle diameter or phi. Returns Equivalent logarithmic size measure. All coefficients and observations are user supplied; results describe only the stated mathematical model. Quantities are deterministic calculations from supplied observations and assumptions; no external data is fetched. Supported limits: Finite inputs only; numeric fields bounded as labelled. Lists and JSON records are limited to 256 entries unless a stricter tool bound is stated. No automatic design approval, legal conclusion, treatment recommendation or safety certification. Phi input is restricted to −50..50 to avoid underflow and unsupported particle scales. Diameter mm or phi value: minimum None, maximum 1000000000000.0. Input: 0 diameter mm; 1 phi: minimum 0, maximum 1.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.