Permeability has the dimension time per length. The SI composite unit of permeability is the kilogram per pascal meter squared second or second per meter.

Maple knows the units of permeability 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, perm[`0degC`]; or, if the context is indicated as the default, by using only the unit name or symbol, for example, perm.

The units of permeability are defined as follows.

A 0 degree Celsius perm is defined as approximately  kilogram per pascal square meter second.

A 23 degree Celsius perm is defined as approximately  kilogram per pascal square meter second.