Aperture

(w) space between adjacent parallel wires

Wire diameter

(d) diameter of wire before weaving

Mesh count

(n) Number of aperture per lineal inch measured from the center of one wire to a point 1 inch distant

Pitch

(p) Distance between the centers of two adjacent wires i.e. w+d

Warp

Wires running lengthwise in the cloth as woven

Weft

Wires running crosswire in the cloth as woven

Open area

The fractional open surface area of the wirecloth in follow direction. (applicable for square meshes only)

Porosity

The fractional void volume of the mesh