Convert Square millimetres per second to Square inches per hour
Convert Square millimetres per second (mm²/s) to Square inches per hour (in²/h) instantly and accurately.
Conversion Formula
in²/h = mm²/s × 5.58001116
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.
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.
Quick Reference Table
| Square millimetres per second (mm²/s) | Square inches per hour (in²/h) |
|---|---|
| 1 mm²/s | 5.58001 in²/h |
| 2 mm²/s | 11.16 in²/h |
| 5 mm²/s | 27.9001 in²/h |
| 10 mm²/s | 55.8001 in²/h |
| 25 mm²/s | 139.5 in²/h |
| 50 mm²/s | 279.001 in²/h |
| 100 mm²/s | 558.001 in²/h |