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What is the speed of ultrasound waves in the air?


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Mohammed Badi
Answered 2021-01-21 11:30:44

The speed of ultrasound waves in a particular medium varies from 330 meters per second (m/sec) in air to 1450 m/sec in fat, 1570 m/sec in blood, and 4080 m/sec in the skull. Hence, ultrasound travel through the air with speed of 330 m/s.

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Answered 2013-03-16 19:32:25

The 'normal' speed of sound is 340 m/s in dry air at room temperature and pressure.

From your question, it appears we should differentiate the terms "ultrasonic" and "supersonic".

Ultrasonic relates to sonic frequencies higher than 20 KHz, i.e. beyond audible range. For a given gas, the speed of sound is independent of the frequency of the sound measured and also independent of the density of the gas.

Supersonic relates to a speed of an object greater than the normal speed of sound (340 m/s in air at STP) and usually the phenomena associated with it.

The speed of sound is also a functionof the medium through which it's passing. For example, the speed of sound through water is 1,500 m/s, and is slightly over 5,000 m/s in iron.

So to answer your question, the speed of ultrasound in airis340 m/s for the reasons given.

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