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# How fast is Mach 1?

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In aeronautics, the Mach number M is the ratio between the speed of an object moving through a medium and the speed of sound of that medium. Mach 1 represents the speed of sound in air, which is approximately 330 meters per second, or 760 miles per hour.

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Flights with M less than 1 occur at speeds lower than the speed of sound and are called subsonic. Similarly, an M value of 1 describes transonic flights, while M values between 1 and 5 define supersonic flights. Aircrafts flying at speeds above Mach 3 typically need to deal with intense heat due to air friction. This becomes a greater issue for flights at more than 5 times the speed of sound, which are also called hypersonic.

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## Related Questions

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Breaking the sound barrier requires exceeding the speed of sound, which is approximately 761 miles per hour at seal level when the air temperature is 59 degrees Fahrenheit. As the temperature decreases, the speed of sound also decreases.

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Velocity ratio is the comparison between the amount of force an object creates and the force around it that acts against the object. Velocity ratio is calculated by dividing the force working against the object with the force exerted by the object.

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The mass of an object does not affect its speed along an inclined plane, presuming that the object's mass does not prevent it from moving altogether. Only the force of gravity, the angle of the incline and the coefficient of friction influence the object's speed.