What is the measurement unit for linear mass density of fibres/fibers, commonly used in grading tights/stockings?
Units of textile measurement kilogram per meter for linear density. The following table summarizes several measures of linear density and gives their conversion factors. Denier () or den (abbreviated D), a unit of measure for the linear mass density of fibers, is the mass in grams per 9000 meters of the fiber. The denier is based on a natural reference: a single strand of silk is approximately one denier; a 9000-meter strand of silk weighs about one gram. The term "denier" comes from the French denier, a coin of small value (worth "sou"). Applied to yarn, a denier was held to be equal in
Linear density unit of mass, formula_9, is equal to the product of its linear mass density, formula_10, and the infinitesimal unit of length, formula_11: The linear mass density can then be understood as the derivative of the mass function with respect to the one dimension of the rod (the position along its length formula_13) The SI unit of linear mass density is the kilogram per meter (kg/m). Linear density of fibers and yarns can be measured by many methods. The simplest one is to measure a length of material and weigh it. However, this requires a large sample and masks the variability