In sieve analysis terminology, “mesh” indicates the number of openings per which reference length?

Introduction / Context:
Understanding mesh terminology is essential for interpreting sieve sizes and correlating with particle diameters. Mesh counts define screening cut points and relate to standard aperture tables.

Given Data / Assumptions:

• Standard wire cloth/sieve nomenclature.
• “Mesh” is a count of openings.

Concept / Approach:
By definition, mesh is the number of openings per linear inch of screen. For example, 50 mesh has 50 openings per linear inch. Aperture size also depends on wire diameter, so two screens with the same mesh may have slightly different clear openings if wire gauges differ.

Step-by-Step Solution:
Recall definition: mesh = openings per linear inch.Select “Linear inch”.

Verification / Alternative check:
ASTM and ISO sieve standards define mesh on a linear basis, with companion tables giving nominal apertures.

Why Other Options Are Wrong:
Square inch/foot and linear foot: not the conventional reference.

Common Pitfalls:
Assuming “per square inch,” which would misstate the count by a factor roughly equal to mesh.

Final Answer:
Linear inch