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| subsonic noise; low-frequency noises | |||
| infrasonic sounds | |||
| infrasonic vibration; infrasound Vibrations of the air at frequencies too low to be perceived as sound by the human ear, below about 15 hertz | |||
| infrasonic noise | |||
| infrasonics | |||
| infrasonic; infrasound | |||
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| infrasonic | |||
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| infrasonic | |||
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Infraschall : 3 phrases in 2 subjects |
| Physics | 1 |
| Technology | 2 |