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 ≈1.792 × 10⁻⁷ m²/s, used in US heat-transfer handbooks and HVAC insulation specifications. Pre-SI tables for building insulation board and refractory brick often list thermal diffusivity in in²/h. Firebrick: ≈3.5 in²/h; rigid foam: ≈0.8-1.2 in²/h. 1 in²/h = 0.00064516/3600 m²/s.
About Square millimetres per second
The square millimetre per second (mm²/s) equals 1 × 10⁻⁶ m²/s and is the standard unit in materials engineering and the laser-flash diffusivity method (ASTM E1461, ISO 22007-4). Metals span roughly 2-180 mm²/s; polymers 0.07-0.2 mm²/s; ceramics 0.3-10 mm²/s. Numerically identical to the kinematic viscosity unit (cSt) in SI context. 1 mm²/s = 1 × 10⁻⁶ m²/s.
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 |