Linear mass density has the dimension mass per length. The SI composite unit of linear mass density is the kilogram per meter.

Maple knows the units of linear mass density listed in the following table.

An asterisk ( * ) indicates the default context, an at sign (@) indicates an abbreviation, and under the prefixes column, SI indicates that the unit takes all SI prefixes, IEC indicates that the unit takes IEC prefixes, and SI+ and SI- indicate that the unit takes only positive and negative SI prefixes, respectively.  Refer to a unit in the Units package by indexing the name or symbol with the context, for example, denier[standard]; or, if the context is indicated as the default, by using only the unit name or symbol, for example, denier.

The units of linear mass density are defined as follows.

A denier is defined as a gram per  meters of thread.

A drex is defined as a gram per  meters of thread.

A tex is defined as a gram per  meters of thread.