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Convert Millimeter/Hour (mm/h) to Mach (20°C, 1 atm) (Ma (20°C)) instantly.

About these units

Millimeter/Hour (mm/h)

A millimeter per hour is extraordinarily slow, used in geology, meteorology, and materials science to measure phenomena like soil creep, tectonic plate micro-motion, or extremely light precipitation (drizzle). In manufacturing, mm/h may describe slow deposition rates in thin-film fabrication or high-precision milling processes. Despite seeming negligible, speeds measured in mm/h can accumulate into significant changes over weeks, months, or years—making them essential for long-term studies.

Mach (20°C, 1 atm) (Ma (20°C))

At 20°C and 1 atmosphere, the speed of sound in air is about 343 m/s, making Mach 1 = 343 m/s under those conditions. Mach numbers classify aerodynamic regimes: Mach 0.3–0.8 (Subsonic), Mach 0.8–1.2 (Transonic), Mach 1–5 (Supersonic), Mach 5+ (Hypersonic). Temperature influences Mach speed significantly; colder air slows sound, while warmer air increases its speed. Aircraft design, jet engines, wind tunnels, aerospace testing, and atmospheric re-entry physics all rely heavily on Mach numbers referenced to standard conditions.

More Millimeter/Hour converters

Millimeter/Hour [mm/h] ↔ Meter/Second [m/s]
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Millimeter/Hour [mm/h] ↔ Kilometer/Hour [km/h]
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Millimeter/Hour [mm/h] ↔ Mile/Hour [mi/h]
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Millimeter/Hour [mm/h] ↔ Foot/Second [ft/s]
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Millimeter/Hour [mm/h] ↔ Kilometer/Second [km/s]
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Millimeter/Hour [mm/h] ↔ Knot [kt]
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Millimeter/Hour [mm/h] ↔ Mach (SI Standard) [Ma]
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Millimeter/Hour [mm/h] ↔ Speed of Light [c]
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Millimeter/Hour [mm/h] ↔ Kilometer/Minute [km/min]
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Millimeter/Hour [mm/h] ↔ Mile/Second [mi/s]
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Millimeter/Hour [mm/h] ↔ Meter/Hour [m/h]
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Millimeter/Hour [mm/h] ↔ Meter/Minute [m/min]
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Millimeter/Hour [mm/h] ↔ Centimeter/Hour [cm/h]
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Millimeter/Hour [mm/h] ↔ Centimeter/Minute [cm/min]
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Millimeter/Hour [mm/h] ↔ Centimeter/Second [cm/s]
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Millimeter/Hour [mm/h] ↔ Millimeter/Minute [mm/min]
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Millimeter/Hour [mm/h] ↔ Millimeter/Second [mm/s]
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Millimeter/Hour [mm/h] ↔ Foot/Hour [ft/h]
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Millimeter/Hour [mm/h] ↔ Foot/Minute [ft/min]
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Millimeter/Hour [mm/h] ↔ Yard/Hour [yd/h]
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Millimeter/Hour [mm/h] ↔ Yard/Minute [yd/min]
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Millimeter/Hour [mm/h] ↔ Yard/Second [yd/s]
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Millimeter/Hour [mm/h] ↔ Mile/Minute [mi/min]
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Millimeter/Hour [mm/h] ↔ Knot (UK) [kt (UK)]
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Millimeter/Hour [mm/h] ↔ Cosmic Velocity - First [v₁]
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Millimeter/Hour [mm/h] ↔ Cosmic Velocity - Second [v₂]
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Millimeter/Hour [mm/h] ↔ Cosmic Velocity - Third [v₃]
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Millimeter/Hour [mm/h] ↔ Earth's Velocity [v⊕]
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Millimeter/Hour [mm/h] ↔ Speed of Sound in Pure Water [vₕ₂ₒ]
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Millimeter/Hour [mm/h] ↔ Speed of Sound in Sea Water [vₛₑₐ]
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Millimeter/Hour [mm/h] ↔ Mach (20°C, 1 atm) [Ma (20°C)]
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Millimeter/Hour [mm/h] ↔ Walking Speed [walk]
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Millimeter/Hour [mm/h] ↔ Running Speed [run]
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Millimeter/Hour [mm/h] ↔ Cycling Speed [cycle]
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Convert Millimeter/Hour to Mach (20°C, 1 atm)