Which particle-size method gives the single true result?
There is no universal answer independent of the measurement definition. Select a technique that answers the stated question and interpret comparisons within each method's scope.
Sieving describes passage through openings; image analysis can describe geometric dimensions; laser diffraction reports a model-based distribution; DLS describes diffusion-related hydrodynamic size in a liquid. Align sample state, size definition and weighting before deciding whether two results should agree. A disagreement is not automatically an instrument fault.
Which size definition fits a particle specification?
For a sieve-retention limit, measure passage through the specified opening. For elongated particles, image length or width may answer the geometric question. Laser diffraction produces a model-based size distribution, while DLS measures diffusion-related hydrodynamic size in a liquid.
Method details to record
| Consideration | What to record |
|---|---|
| Analytical question | Property the decision needs |
| Method definition | Size model and distribution basis |
| Comparison conditions | Sample state and preparation |
What should be aligned before comparing methods?
Record the physical state, preparation, measured dimension and weighting. If two methods use different definitions, compare representative paired observations over the working range before setting an acceptance rule.
Explore particle characterization equipment
Review the equipment details and discuss the supported configuration for your sample.