The average specified diameter of a pipe divided by the minimum specified wall thickness.

Lumber cut to a particular size and stocked for the building industry; usually 2 to 5 in. (5.1 to 12.7

Said of a building material whose dimensions remain relatively constant with changes in temperature and humidity.

A geometric element in design, such as length, angle, or the magnitude of a quantity.

On drawings, abbr. for dimension

Air which is induced or admitted into a flue in order to dilute the products of combustion.

The expansion of cohesionless soils when subject to shearing deformation.