kilogram/pascal/second/square meter Unit Converter

Definition of kilogram/pascal/second/square meter unit

Kilogram per pascal-second-square meter, written kg/(Pa·s·m²), is a derived permeability unit expressing mass flow rate per unit area divided by pressure difference. Since it equals s/m, it characterizes pressure-driven transport through membranes or porous materials.

History of kilogram/pascal/second/square meter unit

The unit arises from twentieth-century work on quantifying permeation through membranes, especially when engineers measured mass flux rather than volumetric flow. Researchers commonly expressed permeability as kilograms per square meter per second per pascal, combining SI mass, area, time, and pressure. Its dimensional equivalence to seconds per meter became clear through SI coherence, because the pascal is derived from kilograms, meters, and seconds. Although many fields now prefer barrers, GPU, or mol/(m²·s·Pa), this SI-form unit remains useful for direct experimental reporting and conversion.

Applications of kilogram/pascal/second/square meter unit

Today, this unit reports membrane permeability in gas separation, packaging films, waterproof textiles, medical barriers, and environmental liners. It describes water-vapor, gas, or other species transmission when mass flux is normalized by exposed area and pressure difference. A value indicates the kilograms crossing one square meter each second under a one-pascal driving pressure.

Complete list of kilogram/pascal/second/square meter unit conversion