Convert Liters per Square Meter per Second to m/s

Formula

m/s = L/(m²·s) ÷ 1000

Derivation from SI units:

• 1 L/(m²·s) = 10⁻³ m³ ÷ (1 m² × 1 s) = 10⁻³ m/s = 1 mm/s
• 1 m/s = 1 m ÷ 1 s (equivalently 1 m³/s of flow per 1 m² of area)

Both units are defined exactly, so the factor is exact. Liter per Square Meter per Second definition: liter per square meter per second; Meter per Second definition: meter per second.

Worked examples

1. A reading of 75 L/(m²·s) converts to 0.075 m/s.
   75 L/(m²·s) × 0.001 = 0.075 m/s
2. A value of 500 L/(m²·s) is 0.5 m/s.
   500 L/(m²·s) × 0.001 = 0.5 m/s

Where it's used

Liters per Square Meter per Second are used for fabric and nonwoven air permeability (EN ISO 9237 at 100 Pa or 200 Pa), while meters per second appear in filter face velocity (ISO 16890 full-size filters ≈ 2.7 m/s). Both measure face velocity and air permeability (volumetric flow per unit area), so the conversion is a fixed factor.

Liter per Square Meter per Second to other face velocity & air permeability units

Frequently asked questions

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).
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 2, coherent derived units.

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.