Kilometer per Second to Foot per Hour
km/h
ft/s
Conversion History
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Quick Reference Table (Kilometer per Second to Foot per Hour)
| Kilometer per Second (km/h) | Foot per Hour (ft/s) |
|---|---|
| 0.3 | 3,543,307.0866 |
| 1 | 11,811,023.622 |
| 7.9 | 93,307,086.6138 |
| 11.2 | 132,283,464.5664 |
| 29.8 | 351,968,503.9356 |
| 300 | 3,543,307,086.6 |
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 Foot per Hour (ft/s)
The foot per hour (ft/h) is a very slow imperial unit of speed, analogous to the metric meter per hour, used when movement is so gradual that expressing it in miles per hour would yield impractically small decimals. One foot per hour is about 0.000085 mph or 0.000305 km/h. The unit finds use in geology (fault creep rates), materials science (crack propagation), and some industrial processes (extrusion rates, slow conveyor speeds). It provides a conveniently sized number when the phenomenon moves on the scale of feet per hour rather than miles per day.
Tectonic fault creep can be a few feet per hour during a slow-slip event. Industrial extruders may run at 10–100 ft/h.
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.
Foot per Hour – Frequently Asked Questions
Do tectonic plates actually move in feet per hour?
Tectonic plates move at 2–15 cm/year on average — far below even 1 ft/h. However, during episodic "slow-slip events" on faults (a kind of slow-motion earthquake), the fault face can creep at detectable rates closer to mm/day. True ft/h movement would be catastrophic — the San Andreas Fault creeping at 1 ft/h would translate to 2.4 miles/day, far exceeding any measured geological rate.
What industrial processes run at speeds measured in ft/h?
Metal extrusion (forming rods or tubes by forcing material through a die) often runs at 1–100 ft/h depending on the alloy and die profile. Some ceramic and glass fiber drawing processes operate in this range. Paper mill wet-end press sections can be as slow as 10–50 ft/h during startup. These speeds are slow enough that workers can safely observe and adjust the process manually.
How does ft/h compare to the speed of a melting iceberg?
Icebergs drift with ocean currents at roughly 0.5–1 km/day, equivalent to about 55–110 ft/h. Calving glaciers can lurch forward at thousands of ft/h during surge events. The famous 2017 calving of iceberg A-68 from the Larsen C ice shelf happened over a period of days — so its "speed" of separation was only a few ft/h at most.
Why would anyone use ft/h instead of just saying inches per day?
It depends on the magnitude. 1 ft/h = 24 ft/day = 288 in/day — for something moving a few feet per hour, inches per day becomes a large awkward number. Conversely, for very slow movement (0.01 ft/h = 2.88 in/day), in/day gives a cleaner number. Engineers choose whichever unit gives a value between roughly 1 and 1,000 to minimize leading zeros.
Is there any creature that moves at about 1 ft/h?
Sea stars (starfish) move at roughly 0.06 m/min, which is about 11.8 ft/h — surprisingly fast. Coral polyps and sea anemones are essentially sessile but can contract at a few mm/min. Some fungi extend their hyphal tips at 1–4 mm/h — about 0.003–0.013 ft/h. Slime molds (Physarum polycephalum), often used in computing research, can advance at up to 4 cm/h (about 1.3 ft/h).