However, the rate of sound varies from fabric to fabric. In common daily language, the speed of sound refers to the speed of the sound waves in the air.
The picture above shows a plane that breaks the sound wall as it passes the sound speed. Although (in the case of gases only) the velocity of the sound is expressed in terms of both density and pressure, these amounts interrupt in ideal gases at any given temperature, composition, and thermal capacity. In addition, for different gases, the velocity of the sound is inversely proportional to the average molecular weight of the gas, and is less affected by the number of ways in which the molecules of the gas can heat up from compression, since the sound of gases is a compression wave. The sound speed in air varies slightly with pressure just because the air is not quite an ideal gas. It is proportional to the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas.
The sound velocity of an ideal gas is independent of the frequency, but does not vary slightly with the frequency in a real gas. Objects moving at speeds greater than Mach1 travel at supersonic speeds. The speed of an object divided by the velocity of the fluid in the fluid is called Mach number. In fluid dynamics, the rate of sound in a fluid medium (gas or liquid) is used as a relative measure of the velocity itself. This is 1 236 kilometers per hour (768 mph), or about one kilometer in three seconds or about one mile in five seconds. In dry air at 20 ° C (68 ° F), the sound speed is 343.2 meters per second (1126 ft / s). The velocity of the sound is the distance during a time unit of a sound wave propagating through an elastic medium.
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