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For example, pressure disturbances in a fluid, as might be caused by an object such as an airplane wing moving through air, radiate at the speed of sound within the fluid. One of the principal uses of the Mach number is to define the behavior of fluid flows. Thus, an airplane flying at 760 MPH at sea level would have a Mach number of 1.0, while at an elevation of 40,000 ft it would have a higher Mach number of almost 1.2. At an elevation of 40,000 ft (12,200 m), however, the temperature is about -70☏ (-57☌), and the velocity of sound in air is only 660 MPH (1,062 km/h). At sea level, for example, the velocity of sound in air at 59☏ (15☌) is about 760 MPH (1,223 km/h). The velocity of sound varies with temperature and also varies from one fluid to another. In the case of a body moving through a fluid, the Mach number is the velocity of the body relative to the fluid divided by the velocity of sound in the fluid. The Mach number is the ratio of the velocity of a fluid to the velocity of sound in that same fluid. It is named after Ernst Mach (1838-1916), the Austrian physicist and philosopher who pioneered the study of supersonic projectiles. As altitude increases, temperature decreases, thus the decrease in the speed of sound.The Mach number is used in fluid mechanics and is especially useful in studies involving supersonic aerodynamics. I believe that the speed of sound is only dependent on temperature and nothing else. September 27, Air also becomes thinner the higher you go, amps a decibels are used to measure sound not its speed. as a matter of fact, there are airplanes that are super sonic, which means faster than sounds and they can break sound speed of sound is measured in terms of mach. October 4, if an airplane flew faster than the speed of sound it won't explode. How fast can sound waves travel at the absolute zero? Isn't it amazing how God created everything so perfectly, like sound waves, even down to the tiniest detail? Even the smallest bone in the body, located in the ear. How is the speed of light related to the speed of sound? The planes didn't explode they just broke apart. That is why they changed to delta shaped or swept back wings. June 15, As airplanes went faster and faster, the design of the wings created stresses that caused both loss of control and structural failure at the transition to speeds higher than the speed of sound. May scientific calculations are based solely on this number alone. It has a constant and finite speed of 186,000 miles per second. Light, on the other hand, is an electromagnetic force. Also, one can assume that if there is no media to transmit the wave then there is no sound. In water, sound travels approximately 4800 feet per second, more than four times faster than in air. See a flash of lightning then start counting. For approximately every five seconds the sound travels is one mile. The old lightning/thunder trick offers a good example. The speed of sound through air at ground level is approximately 760 mph, or approximately 1100 feet per second. Simply put, the denser the material the faster the sound waves travel. Sound propagates through a medium (liquid, solid, gas), and the properties of those media determine the actual speed.
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What is the number to break the speed of sound?