Convert Square inches per hour to Square millimetres per second
Convert Square inches per hour (in²/h) to Square millimetres per second (mm²/s) instantly and accurately.
Conversion Formula
mm²/s = in²/h × 0.1792111111
About Square inches per hour
The square inch per hour (in²/h) equals 0.0254²/3600 ≈ 1.792 × 10⁻⁷ m²/s. It is found in US heat-transfer and diffusion textbooks that use the BTU-inch-hour unit system alongside thermal diffusivity tables. 1 in²/h ≈ 0.1792 cSt.
About Square millimetres per second
The square millimetre per second (mm²/s) equals 10⁻⁶ m²/s, numerically identical to 1 centistoke (cSt). It is the preferred SI-consistent expression: ISO 3104, DIN 51562, and ASTM viscosity standards all use mm²/s interchangeably with cSt. Water at 20 °C ≈ 1.004 mm²/s; SAE 10W-30 at 100 °C: 9.3-12.5 mm²/s. 1 mm²/s = 1 cSt.
Quick Reference Table
| Square inches per hour (in²/h) | Square millimetres per second (mm²/s) |
|---|---|
| 1 in²/h | 0.179211 mm²/s |
| 2 in²/h | 0.358422 mm²/s |
| 5 in²/h | 0.896056 mm²/s |
| 10 in²/h | 1.79211 mm²/s |
| 25 in²/h | 4.48028 mm²/s |
| 50 in²/h | 8.96056 mm²/s |
| 100 in²/h | 17.9211 mm²/s |