Convert Square inches per hour to Square millimetres per hour
Convert Square inches per hour (in²/h) to Square millimetres per hour (mm²/h) instantly and accurately.
Conversion Formula
mm²/h = in²/h × 645.16
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 hour
The square millimetre per hour (mm²/h) equals 1/(3.6 × 10⁹) m²/s ≈ 2.78 × 10⁻¹⁰ m²/s. It appears in materials science for solid-state diffusion and thin-film growth studies where hourly timescales are more natural than seconds. 1 mm²/h = 1/3600 mm²/s = 1/3600 cSt.
Quick Reference Table
| Square inches per hour (in²/h) | Square millimetres per hour (mm²/h) |
|---|---|
| 1 in²/h | 645.16 mm²/h |
| 2 in²/h | 1290.32 mm²/h |
| 5 in²/h | 3225.8 mm²/h |
| 10 in²/h | 6451.6 mm²/h |
| 25 in²/h | 16129 mm²/h |
| 50 in²/h | 32258 mm²/h |
| 100 in²/h | 64516 mm²/h |