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Wikipedia.org
Speed of sound (Wikipedia.org)

Sound is a vibration that travels through an elastic medium as a wave. The speed of sound describes how much distance such a wave travels in a certain amount of time. In dry air with a temperature of 21 °C (70 °F) the speed of sound is 344 m/s (1230 km/h, or 770 mph, or 1130 ft/s). Although it is commonly used to refer specifically to air, the speed of sound can be measured in virtually any substance. The speed of sound in liquids and non-porous solids is much higher than that in air.

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Sound needs a medium to travel through. Sound travels faster in liquids and solids than in air because the particles of liquids and solids are packed closer together. The speed of sound is much ...
2m 17s |
a year ago
HowStuffWorks
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Travel faster than the speed of sound on the revolutionary NASA X-43. This aircraft travels at hypersonic speeds topping at about 10,000 km/hour. Learn more about the world's fastest aircraft on...  ...
2m 10s |
a year ago
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Solar Dynamics Observatory Launch, Feb 11, 2010 HD VERSION A sun dog is a prismatic bright spot in the sky caused by sun shining through ice crystals. The Atlas V rocket exceeded the speed of sound ...
2m 56s |
a month ago
YouTube
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496915
Developed for the USAF as reconnaissance aircraft more than 40 years ago, SR-71s are still the world's fastest and highest-flying production aircraft. The aircraft can fly more than 2200 mph (Mach 3+ ...
4m 37s |
2 years ago
YouTube
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Learn more about the major developments of the year 1948, from a rocket faster than the speed of sound to the convergence of the Soviets on the Chinese capital.
50m 32s |
a year ago
HowStuffWorks
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Massachusetts Institute of Technology
Lecture 26: Elasticity - Young's Modulus Topics on this video include: Elasticity of Materials, Measuring Stress vs. Strain, Spring Constant of a Wire, Speed of Sound in Materials and Demo with a 2 ...
50m 19s |
2 years ago
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On August 16, 1960, Joe Kittinger was strapped into an specially modified U.S. Air Force balloon and set off on an ascent into the clouds. After 4 hours he reached the edge of space at a record ...
4m 35s |
3 years ago
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50 foot tall taped up plastic bag goes bang at over 1250 feet per second thats over 850 mph thats faster than the speed of sound. Popped so fast that it happened in less than one frame on my camera. ...
0m 16s |
3 years ago
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