Convert Millimetres per Second At 100 Pa to Gurley Seconds
Millimetres per Second At 100 Pa and Gurley seconds are inversely related: s/100 mL = 12.70809506 ÷ mm/s @100 Pa, so 15 mm/s @100 Pa = 0.8472063371 s/100 mL.
Also searched as millimetres per second at 100 Pa to s/100 mL, millimetres per second at 100 Pa in s/100 mL, millimetres per second at 100 Pa into Gurley seconds, mm/s @100 Pa to s/100 mL, mm/s @100 Pa in Gurley seconds, mm/s @100 Pa into Gurley second, millimetre per second at 100 Pa to Gurley second, mm/s @100 Pa to Gurley seconds converter and millimeters per second at 100 Pa to Gurley seconds.
1 mm/s @100 Pa = 12.70809506 s/100 mL
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimetre per second at 100 Pa to Gurley second converter to paste a column from Excel.
How to Convert Millimetre per Second At 100 Pa to Gurley Second
- s/100 mL = 12.70809506 ÷ mm/s @100 Pa
- mm/s @100 Pa = 12.70809506 ÷ s/100 mL
- Example: convert 15 mm/s @100 Pa to s/100 mL: 12.70809506 ÷ 15 = 0.8472063371 s/100 mL
Reference conditions. mm/s @100 Pa: Test pressure 100 Pa (ISO 9237 apparel fabrics); assumes flow proportional to pressure difference. s/100 mL: 100 mL through 6.45 cm² (1 in²) at 1.22 kPa (TAPPI T 460, ISO 5636-5); assumes air flow proportional to pressure difference.
Formula
s/100 mL = 12.70809505655 ÷ mm/s @100 Pa
Derivation from SI units:
- 1 mm/s ÷ 100 Pa = 10⁻⁵ m/(Pa·s) = 10 µm/(Pa·s); the same number as L/(m²·s) at 100 Pa.
- Gurley t = seconds for 100 mL of air through 6.45 cm² at 1.22 kPa, so P = 100 mL ÷ (6.45 cm² × 1.22 kPa × t) ≈ 127.08 ÷ t µm/(Pa·s).
- Solving for s/100 mL: s/100 mL = 12.70809505655 ÷ mm/s @100 Pa (a higher mm/s @100 Pa means a lower s/100 mL)
One unit is a measured value, so the factor is approximate. Millimetre per Second At 100 Pa definition: millimetre per second at 100 Pa; Gurley Second definition: Gurley second.
Worked examples
- A reading of 20 mm/s @100 Pa converts to 0.6354047528 s/100 mL.
12.70809506 ÷ 20 = 0.6354047528 s/100 mL - A value of 200 mm/s @100 Pa is 0.06354047528 s/100 mL.
12.70809506 ÷ 200 = 0.06354047528 s/100 mL
Millimetre per Second At 100 Pa to Gurley Second conversion table
| Millimetres per Second At 100 Pa (mm/s @100 Pa) | Gurley Seconds (s/100 mL) |
|---|---|
| 1 mm/s @100 Pa | 12.70809506 s/100 mL |
| 5 mm/s @100 Pa | 2.541619011 s/100 mL |
| 10 mm/s @100 Pa | 1.270809506 s/100 mL |
| 20 mm/s @100 Pa | 0.6354047528 s/100 mL |
| 50 mm/s @100 Pa | 0.2541619011 s/100 mL |
| 100 mm/s @100 Pa | 0.1270809506 s/100 mL |
| 200 mm/s @100 Pa | 0.06354047528 s/100 mL |
| 500 mm/s @100 Pa | 0.02541619011 s/100 mL |
| 1000 mm/s @100 Pa | 0.01270809506 s/100 mL |
| 2000 mm/s @100 Pa | 0.006354047528 s/100 mL |
Where it's used
Millimetres per Second At 100 Pa are used for apparel and shirting fabrics (ISO 9237), while Gurley seconds appear in paper, board and sack kraft porosity. Both measure air permeance (air flow per unit area per unit pressure difference), but one system is the inverse of the other, so a fixed constant is divided by the value.
Millimetre per Second At 100 Pa to other air permeance units
| Conversion | 1 mm/s @100 Pa equals |
|---|---|
| millimetre per second at 100 Pa to Gurley second | 12.70809506 s/100 mL |
| millimetre per second at 100 Pa to micrometre per pascal second | 10 µm/(Pa·s) |
| millimetre per second at 100 Pa to Frazier | 0.2460629921 cfm/ft² @125 Pa |
| millimetre per second at 100 Pa to Bendtsen | 882 mL/min (Bendtsen) |
| millimetre per second at 100 Pa to millimetre per second at 200 Pa | 2 mm/s @200 Pa |
Frequently asked questions
What is the formula for millimetres per second at 100 Pa to Gurley seconds?
s/100 mL = 12.70809506 ÷ mm/s @100 Pa. The two systems are inversely related, so divide the constant by the value; do not multiply. For example, 12.70809506 ÷ 15 = 0.8472063371 s/100 mL.
Why does a higher mm/s @100 Pa give a lower s/100 mL?
Gurley Seconds counts length per unit mass (an indirect system), while millimetres per second at 100 Pa counts mass per unit length (a direct system). A finer yarn has a higher indirect number and a lower direct number.
Is the mm/s @100 Pa to s/100 mL conversion exact?
Not exactly. The millimetre per second at 100 Pa is a measured value (Test pressure 100 Pa (ISO 9237 apparel fabrics); assumes flow proportional to pressure difference.). The Gurley second is a measured value (100 mL through 6.45 cm² (1 in²) at 1.22 kPa (TAPPI T 460, ISO 5636-5); assumes air flow proportional to pressure difference.). Results are good to about 5 significant figures.
Sources
- ISO 9237:1995 Textiles — Determination of the permeability of fabrics to air, International Organization for Standardization .
- ISO 5636 Paper and board — Determination of air permeance (Part 3: Bendtsen method; Part 5: Gurley method), International Organization for Standardization , Part 5, Gurley method.
- TAPPI T 460 om-21 Air resistance of paper (Gurley method), TAPPI .
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). Convert Millimetres per Second At 100 Pa to Gurley Seconds. Retrieved October 29, 2026, from https://scientificconverters.com/air-permeance/millimeters-per-second-at-100-pa-to-gurley-seconds/
IEEE
Scientific Converters, "Convert Millimetres per Second At 100 Pa to Gurley Seconds," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/air-permeance/millimeters-per-second-at-100-pa-to-gurley-seconds/