Factor |
Value (m/s) |
Value (km/h) |
Value (mph) |
Item |
10−18 |
2.2×10−18 | 7.8×10−18 | 4.9×10−18 |
Expansion rate between 2 points in free space 1 m apart under Hubble's law. |
10−11 |
9.8×10−11 | 3.5×10−10 | 2.2×10−10 |
Rate of global sea level rise in 1993–2003 (3.1 mm/yr).[1] |
10−10 |
3×10−10 to 3×10−9 | 1×10−9 to 1×10−8 | 7×10−10 to 7×10−9 |
Typical relative speed of continental drift. |
10−9 |
1.3×10−9 | 4.68×10−9 | 2.9×10−9 |
Average rate of the Moon receding from the Earth (approx. 38 mm/yr). |
4.8×10−9 | 1.7×10−8 | 1.1×10−8 |
Human hair growth (average rate—note that there is a great range of variation). |
10−6 |
1.52×10−6 | 5.4×10−6 | 3.4×10−6 |
Speed of a cellular vesicle propelled by a motor protein.[2] |
10−5 |
1.4×10−5 | 5.0×10−5 | 3.1×10−5 |
Growth rate of bamboo, the fastest-growing woody plant, over 24 hours.[3] |
10−4 |
4.0×10−4 | 1.4×10−3 | 8.9×10−4 |
Speed of Jakobshavn Isbræ, one of the fastest glaciers, in 2003.[4] |
6×10−4 | 2.2×10−3 | 1.3×10−3 |
Typical speed of Thiovulum majus, the fastest-swimming bacterium.[5] |
10−3 |
0.00275 | 0.00990 | 0.00615 |
World record speed of the fastest snail in the Congham, UK.[6] |
10−2 |
0.0476 | 0.171 | 0.106 |
Compact cassette tape speed.[7] |
0.080 | 0.29 | 0.18 |
The top speed of a sloth. |
10−1 |
0.2778 | 1 | 0.6214 |
1 km/hour. |
0.44704 | 1.609344 | 1 |
1 mph. |
0.5144 | 1.852 | 1.151 |
1 knot (nautical mile per hour) |
100 |
1.2 | 4.32 | 2.68 |
Typical scanning speed of an audio compact disc; the speed of signals (action potentials) traveling along axons in the human cortex. |
1–1.5 | 3.6–5.4 | 2.2–3.4 |
Average walking speed—below a speed of about 2 m/s, it is more efficient to walk than to run, but above that speed, it is more efficient to run. |
2.39 | 8.53 | 5.35 |
World record time 50m freestyle swim |
5.72 | 20.42 | 12.80 |
World record time marathon |
6–7 | 20–25 | 12–15 |
Comfortable bicycling speed. |
101 |
10.438 | 37.578 | 23.35 |
Average speed of Jamaican athlete Usain Bolt while setting the 100m world record in Berlin on 16 August 2009. |
12.42 | 44.72 | 27.78 |
Top speed reached by Bolt during the same race. |
8–14 | 30–50 | 18–31 |
Typical residential speed limit; top speed of a running cat or dog. |
14 | 50 | 31 |
Typical speed of road-race cyclist. |
17 | 60 | 37 |
Typical speed of thoroughbred racehorse or racing greyhound. |
5–25 | 18–90 | 11–56 |
Speed of propagation for unmyelinated sensory neurons. |
30 | 110 | 70 |
Typical speed of car (freeway); cheetah—fastest of all terrestrial animals; sailfish—fastest fish; speed of go-fast boat. |
37.16 | 133.78 | 83.13 |
Land speed record for a human powered vehicle.[8] |
40 | 140 | 90 |
Typical peak speed of a local service train (or intercity on lower standard tracks). |
67 | 240 | 149 |
The top speed of the world's fastest roller coaster, Formula Rossa. |
90 | 320 | 200 |
Typical speed of a modern high-speed train (e.g. latest generation of production TGV); a diving peregrine falcon—fastest bird; 320 km/h or 200 mph is a parameter sometimes used in defining a supercar.[9] |
91 | 328 | 204 |
Fastest recorded ball (a golf ball) in sports.[10] |
102 |
103 | 370 | 230 |
Speed of super torpedo VA-111 Shkval. |
103.5 | 372.6 | 231.5 |
Maximum speed recorded by a Formula One car. Set by Juan Pablo Montoya during the 2005 Italian Grand Prix at Monza in a McLaren MP4-20. |
105.5 | 379.8 | 236 |
Maximum speed of a Ferrari F50 GT1. |
113 | 408 | 254 |
Fastest non-tornadic wind gust recorded on Earth - at Barrow Island, Australia on 1996-04-10 during Severe Tropical Cyclone Olivia.[11] |
119.742 | 431.072 | 267.86 |
Maximum speed of the Bugatti Veyron Super Sport (currently the fastest production car in the world). |
120 | 432 | 270 |
Speed of propagation for mammalian motor neurons. |
130 | 468 | 290 |
Wind speed of a powerful tornado. |
150.6 | 539 | 337 |
Top speed of an internal-combustion-powered NHRA Top Fuel Dragster. |
157 | 575 | 351 |
Top speed of experimental test TGV train in 2007. |
161 | 580 | 360 |
Top speed of JR-Maglev in 2003. |
250 | 900 | 560 |
Typical cruising speed of a modern jet airliner, e.g. an Airbus A380. |
314 | 1,130 | 702 |
Top speed of any World War II-era aircraft, the Me 163B V18 set on July 6, 1944. |
320 | 1,200 | 720 |
The speed of a typical .22 LR bullet. |
340.3 | 1,225 | 761 |
Speed of sound in standard atmosphere (15 °C and 1 atm). |
344.66 | 1,240.77 | 770.98 |
Max speed reached by the jet-propelled car ThrustSSC in 1997—Land speed record.[12] |
373 | 1,342.8 | 833.9 |
Highest speed recorded during a free fall set by Felix Baumgartner. |
428 | 1,540.8 | 957 |
Max speed of Bell X-1. |
464 | 1,670 | 1,040 |
Speed of Earth's rotation at the equator. |
603 | 2,170.8 | 1,350 |
Speed of the Concorde airliner. |
975 | 3,510 | 2,180 |
Muzzle velocity of M16 rifle. |
981 | 3,532 | 2,194 |
SR-71 Blackbird, the fastest aircraft driven by a mechanical jet engine. |
103 |
1,400 | 5,040 | 3,100 |
Speed of the Space Shuttle when the solid rocket boosters separate. |
1,500 | 5,400 | 3,400 |
Speed of sound in water or in soft tissue.[13] |
1,789 | 6,443 | 4,002 |
Speed of BrahMos II hypersonic cruise missile |
2,000 | 7,200 | 4,500 |
Estimated speed of a thermal neutron. |
2,019 | 7,268.4 | 4,516 |
Speed of the North American X-15 rocket plane. |
2,375 | 8,550 | 5,345 |
Escape velocity from Moon. |
2,700 | 9,600 | 6,000 |
Speed of wind on exoplanet HD 189733 b.[14] |
2,885 | 10,385 | 6,453 |
Top speed of the fastest rocket sled.[15] |
3,373 | 12,144 | 7,546 |
Speed of the X-43 rocket/scramjet plane. |
4,500 | 16,000 | 10,000 |
A typical value for the specific impulse of current rockets. |
7,700 | 27,700 | 17,200 |
Speed of International Space Station and typical speed of other satellites such as the Space Shuttle in low Earth orbit. |
7,777 | 28,000 | 17,400 |
Speed of propagation of the explosion in a detonating cord. |
104 |
11,107 | 39,985.2 | 24,846 |
0.00004 c | Speed of Apollo 10 – high speed record for human-crewed vehicle. |
11,200 | 40,320 | 25,100 |
0.00004 c | Escape velocity from Earth. |
16,100 | 57,900 | 36,000 |
0.00005 c | Fastest projectile velocity (1994).[16] |
16,210 | 58,356 | 36,261 |
0.00005 c | Escape speed from Earth by NASA New Horizons spacecraft—Fastest escape velocity. |
17,000 | 61,000 | 38,000 |
0.00006 c | The approximate speed of the Voyager 1 probe relative to the sun, when it exited the Solar System.[17] |
29,800 | 107,280 | 66,700 |
0.00010 c | Speed of the Earth in orbit around the Sun. |
47,800 | 172,100 | 106,900 |
0.00016 c | Atmospheric entry speed of the Galileo atmospheric probe—Fastest controlled atmospheric entry for a man-made object. |
70,220 | 252,800 | 157,100 |
0.00023 c | Speed of the Helios 2 solar probe—Fastest man-made object. |
105 |
140,000 | 540,000 | 313,170 |
0.00047 c | Approaching velocity of Messier 98 to our galaxy. |
200,000 | 700,000 | 450,000 |
0.0007 c | Orbital speed of the solar system in the Milky Way galaxy. |
440,000 | 1,600,000 | 980,000 |
0.0015 c | Typical speed of the stepped leader of lightning (cf. return stroke below).[18] |
450,000 | 1,600,000 | 1,000,000 |
0.0015 c | Typical speed of a particle of the solar wind, relative to the Sun. |
552,000 | 1,990,000 | 1,230,000 |
0.00184 c | Speed of the Milky Way, relative to the cosmic microwave background. |
617,700 | 2,224,000 | 1,382,000 |
0.00206 c | Escape velocity from the surface of the Sun. |
106 |
1,000,000 | 3,600,000 | 2,200,000 |
0.003 c | Typical speed of a Moreton wave across the surface of the Sun. |
1,610,000 | 5,800,000 | 3,600,000 |
0.00537 c | Speed of hypervelocity star PSR B2224+65, which currently seems to be leaving the Milky Way. |
5,000,000 | 18,000,000 | 11,000,000 |
0.017 c | Estimated minimum speed of star S2 at its closest approach to Sagittarius A*.[19] |
107 |
14,000,000 | 50,000,000 | 31,000,000 |
0.047 c | Typical speed of a fast neutron. |
30,000,000 | 100,000,000 | 70,000,000 |
0.1 c | Typical speed of an electron in a cathode ray tube. |
108 |
100,000,000 | 360,000,000 | 220,000,000 |
0.3 c | The escape velocity of a neutron star. |
100,000,000 | 360,000,000 | 220,000,000 |
0.3 c | Typical speed of the return stroke of lightning (cf. stepped leader above).[20] |
124,000,000 | 447,000,000 | 277,000,000 |
0.4136 c | Speed of light in a diamond (Refractive index 2.417). |
200,000,000 | 720,000,000 | 440,000,000 |
0.7 c | Speed of a signal in an optical fiber. |
299,792,456 | 1,079,252,840 | 670,615,282 |
0.99999 9991 c | Speed of the 7 TeV protons in the Large Hadron Collider at full power.[21] |
299,792,458 − 1.5×10−15 | 1,079,252,848.8 − 5.4×10−15 | 670,616,629.4 |
1 − 4.9×10−24 c | Speed of the Oh-My-God particle ultra-high-energy cosmic ray.[22] |
299,792,458 | 1,079,252,848.8 | 670,616,629.4 |
1 c | Speed of light or other electromagnetic radiation in a vacuum. Also, Planck speed. |