Convert Gurley Seconds to Millimetres per Second At 200 Pa
Gurley Seconds and millimetres per second at 200 Pa are inversely related: mm/s @200 Pa = 25.41619011 ÷ s/100 mL, so 15 s/100 mL = 1.694412674 mm/s @200 Pa.
Also searched as Gurley seconds to mm/s @200 Pa, Gurley seconds in mm/s @200 Pa, Gurley seconds into millimetres per second at 200 Pa, s/100 mL to mm/s @200 Pa, s/100 mL in millimetres per second at 200 Pa, s/100 mL into millimetre per second at 200 Pa, Gurley second to millimetre per second at 200 Pa, s/100 mL to millimetres per second at 200 Pa converter and Gurley seconds to millimeters per second at 200 Pa.
1 s/100 mL = 25.41619011 mm/s @200 Pa
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk Gurley second to millimetre per second at 200 Pa converter to paste a column from Excel.
How to Convert Gurley Second to Millimetre per Second At 200 Pa
- mm/s @200 Pa = 25.41619011 ÷ s/100 mL
- s/100 mL = 25.41619011 ÷ mm/s @200 Pa
- Example: convert 15 s/100 mL to mm/s @200 Pa: 25.41619011 ÷ 15 = 1.694412674 mm/s @200 Pa
Reference conditions. 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. mm/s @200 Pa: Test pressure 200 Pa (ISO 9237 industrial fabrics, EN filter media); assumes flow proportional to pressure difference.
Formula
mm/s @200 Pa = 25.4161901131 ÷ s/100 mL
Derivation from SI units:
- 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).
- 1 mm/s ÷ 200 Pa = 5 × 10⁻⁶ m/(Pa·s) = 5 µm/(Pa·s).
- Solving for mm/s @200 Pa: mm/s @200 Pa = 25.4161901131 ÷ s/100 mL (a higher s/100 mL means a lower mm/s @200 Pa)
One unit is a measured value, so the factor is approximate. Gurley Second definition: Gurley second; Millimetre per Second At 200 Pa definition: millimetre per second at 200 Pa.
Worked examples
- A reading of 20 s/100 mL converts to 1.270809506 mm/s @200 Pa.
25.41619011 ÷ 20 = 1.270809506 mm/s @200 Pa - A value of 100 s/100 mL is 0.2541619011 mm/s @200 Pa.
25.41619011 ÷ 100 = 0.2541619011 mm/s @200 Pa
Gurley Second to Millimetre per Second At 200 Pa conversion table
| Gurley Seconds (s/100 mL) | Millimetres per Second At 200 Pa (mm/s @200 Pa) |
|---|---|
| 1 s/100 mL | 25.41619011 mm/s @200 Pa |
| 5 s/100 mL | 5.083238023 mm/s @200 Pa |
| 10 s/100 mL | 2.541619011 mm/s @200 Pa |
| 20 s/100 mL | 1.270809506 mm/s @200 Pa |
| 30 s/100 mL | 0.8472063371 mm/s @200 Pa |
| 50 s/100 mL | 0.5083238023 mm/s @200 Pa |
| 100 s/100 mL | 0.2541619011 mm/s @200 Pa |
| 200 s/100 mL | 0.1270809506 mm/s @200 Pa |
| 500 s/100 mL | 0.05083238023 mm/s @200 Pa |
| 1000 s/100 mL | 0.02541619011 mm/s @200 Pa |
Where it's used
Gurley Seconds are used for paper, board and sack kraft porosity, while millimetres per second at 200 Pa appear in industrial and filter fabrics. 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.
Gurley Second to other air permeance units
| Conversion | 1 s/100 mL equals |
|---|---|
| Gurley second to millimetre per second at 200 Pa | 25.41619011 mm/s @200 Pa |
| Gurley second to micrometre per pascal second | 127.0809506 µm/(Pa·s) |
| Gurley second to Frazier | 3.126991894 cfm/ft² @125 Pa |
| Gurley second to Bendtsen | 11208.53984 mL/min (Bendtsen) |
| Gurley second to millimetre per second at 100 Pa | 12.70809506 mm/s @100 Pa |
Frequently asked questions
What is the formula for Gurley seconds to millimetres per second at 200 Pa?
mm/s @200 Pa = 25.41619011 ÷ s/100 mL. The two systems are inversely related, so divide the constant by the value; do not multiply. For example, 25.41619011 ÷ 15 = 1.694412674 mm/s @200 Pa.
Why does a higher s/100 mL give a lower mm/s @200 Pa?
Gurley Seconds counts length per unit mass (an indirect system), while millimetres per second at 200 Pa counts mass per unit length (a direct system). A finer yarn has a higher indirect number and a lower direct number.
Is the s/100 mL to mm/s @200 Pa conversion exact?
Not exactly. 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.). The millimetre per second at 200 Pa is a measured value (Test pressure 200 Pa (ISO 9237 industrial fabrics, EN filter media); assumes flow proportional to pressure difference.). Results are good to about 5 significant figures.
Sources
- 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 .
- ISO 9237:1995 Textiles — Determination of the permeability of fabrics to air, International Organization for Standardization .
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 Gurley Seconds to Millimetres per Second At 200 Pa. Retrieved October 29, 2026, from https://scientificconverters.com/air-permeance/gurley-seconds-to-millimeters-per-second-at-200-pa/
IEEE
Scientific Converters, "Convert Gurley Seconds to Millimetres per Second At 200 Pa," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/air-permeance/gurley-seconds-to-millimeters-per-second-at-200-pa/