Kilometer per Second to Meter per Hour
km/h
m/s
Conversion History
| Conversion | Reuse | Delete |
|---|---|---|
| No conversion history to show. | ||
Quick Reference Table (Kilometer per Second to Meter per Hour)
| Kilometer per Second (km/h) | Meter per Hour (m/s) |
|---|---|
| 0.3 | 1,080,000 |
| 1 | 3,600,000 |
| 7.9 | 28,440,000 |
| 11.2 | 40,320,000 |
| 29.8 | 107,280,000 |
| 300 | 1,080,000,000 |
About Kilometer per Second (km/h)
The kilometer per second (km/s) is a large unit of speed used in astronomy, geophysics, and high-speed projectile contexts. At this scale, everyday transport is negligible — a km/s is 3,600 km/h, roughly three times the speed of a commercial aircraft. Earth orbits the Sun at about 29.8 km/s. The speed of seismic P-waves through rock is approximately 5–8 km/s. Spacecraft escape velocity from Earth is around 11.2 km/s. Bullets travel at 0.3–1.0 km/s. The unit is not used in everyday life but is practical for planetary and astrophysical calculations.
Earth travels around the Sun at about 29.8 km/s. A rifle bullet travels at roughly 0.9 km/s.
About Meter per Hour (m/s)
The meter per hour (m/h) is an extremely slow unit of speed, rarely used in everyday contexts but useful for expressing very gradual movement — geological processes, biological growth, or slow industrial feed rates. One meter per hour is about 0.001 km/h or 0.00028 m/s. Glaciers move at roughly 100–3,000 m/h (0.1–3 m per hour is typical). Snails travel at about 50 m/h. The unit provides a convenient scale for phenomena that would otherwise require small decimals in m/s or km/h.
A garden snail moves at roughly 50 m/h. A glacier advances at 100–1,000 m/h depending on the ice sheet.
Kilometer per Second – Frequently Asked Questions
How fast does Earth orbit the Sun in km/s?
Earth orbits the Sun at an average of about 29.8 km/s (107,000 km/h). This speed varies slightly because Earth's orbit is elliptical — it moves fastest in January (perihelion) at 30.3 km/s and slowest in July (aphelion) at 29.3 km/s. You're traveling at this speed right now relative to the Sun.
What is escape velocity in km/s?
Escape velocity is the minimum speed needed to leave a body's gravitational influence without further propulsion. From Earth's surface it's 11.2 km/s. From the Moon it's 2.4 km/s. From the Sun's surface it's 617.5 km/s. The Voyager 1 spacecraft left Earth's sphere of influence at about 16.6 km/s.
How fast do seismic waves travel in km/s?
Primary (P) waves travel at 5–8 km/s through Earth's crust, reaching 13 km/s in the mantle and core. Secondary (S) waves travel at roughly 60% of P-wave speed. This speed difference is why seismologists can calculate earthquake distance — the gap between the P and S wave arrival times reveals how far the sensor is from the epicenter.
What speed do meteors enter the atmosphere in km/s?
Meteoroids enter Earth's atmosphere at 11–72 km/s, depending on whether they're moving with or against Earth's orbital direction. The friction at these speeds heats them to incandescence — the streak of light visible as a 'shooting star'. Most disintegrate completely above 80 km altitude. The upper bound of 72 km/s is the sum of Earth's orbital speed plus the body's own velocity.
How fast is a rifle bullet in km/s?
A typical high-powered rifle round (e.g. 7.62×51mm NATO) travels at about 0.85 km/s (850 m/s or 3,060 km/h). Purpose-built anti-materiel rifles reach ~1.0 km/s. Railgun projectiles in military experiments have exceeded 3 km/s. All of these are far below orbital speed — getting to orbit requires speed, not just height.
Meter per Hour – Frequently Asked Questions
How fast does a glacier move in meters per hour?
Most valley glaciers advance at 20–200 m/h (0.5–5 m/day). Surge glaciers — which periodically accelerate — can reach 1,000–10,000 m/h for months at a time. The Jakobshavn Glacier in Greenland holds the record for the fastest sustained glacier flow at roughly 4,600 m/h (46 m/day). For context, that's still far slower than a garden snail.
How fast does hair grow in m/h?
Human scalp hair grows at roughly 15 cm per year — about 0.017 mm/hour, or 0.000017 m/h. Nails grow at about half that rate. At this scale, even the m/h unit is too large; growth biologists use mm/day or cm/month. The fastest-growing human tissue is bone marrow, not hair.
What moves at around 1 meter per hour?
Some lava flows on gently sloping terrain advance at about 1 m/h. Tectonic plates move at 2.5–15 cm/year — far below even 1 m/h. Bread rising in a warm kitchen expands at a few mm/hour. Corrosion front advancement in protected steel structures can be tracked in mm or cm per year.
Is m/h the same as m/hr?
m/h and m/hr are both used for meters per hour — neither is an official SI notation, since the SI symbol for hour is h (not hr). The correct SI notation is m/h. In engineering documentation, m/hr appears frequently as a stylistic choice, particularly in American engineering texts that prefer "hr" over "h" for legibility.
How do you convert m/h to mm/day?
Multiply by 24,000. One m/h = 1,000 mm/h × 24 h/day = 24,000 mm/day. This conversion is useful in hydrology (soil permeability is measured in mm/day) and biology (plant growth, wound healing rates). A glacier moving at 100 m/h would be advancing 2,400,000 mm/day — or 2.4 km/day, which is an exceptionally fast surge.