Liter per Square Meter per Second (L/(m²·s))
The litre per square metre per second, L/(m²·s), is the air permeability unit used on European fabric and nonwoven datasheets. Because 1 L = 10⁻³ m³, it is exactly equal to 1 mm/s.
Symbol: L/(m²·s) (ASCII: L/m2/s)
Quantity: face velocity and air permeability (volumetric flow per unit area)
SI relation: 1 L/(m²·s) = 0.001 m/s (exact)
Derivation: 1 L/(m²·s) = 10⁻³ m³ ÷ (1 m² × 1 s) = 10⁻³ m/s = 1 mm/s
Exact: yes, by definition
Same quantity as millimeter per second (mm/s) : the factor between them is exactly 1.
Typical uses
- Fabric and nonwoven air permeability (EN ISO 9237 at 100 Pa or 200 Pa)
- Filter media and airbag fabric specifications
- Building-envelope component leakage
Convert liters per square meter per second to other units
Open the Face Velocity & Air Permeability Converter to convert any value between all units.
Sources
- ISO 9237:1995 Textiles — Determination of the permeability of fabrics to air, International Organization for Standardization , air permeability expressed per unit area.
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 (litre).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Liter per Square Meter per Second (L/(m²·s)). Retrieved October 17, 2026, from https://scientificconverters.com/units/liter-per-square-meter-per-second/
IEEE
Scientific Converters, "Liter per Square Meter per Second (L/(m²·s))," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/liter-per-square-meter-per-second/