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This is a classical existential philosophical question. Sound is caused by vibration of air molecules – the wave set up travels in all directions. So there is a sound. Btw I should think some animal will be around an maybe be alarmed by it. Of course if our (rather arrogant) definition of the existence of any phenomenon is that it has to be in the mind of human the answer is different. Sound (Cool Grinch Iowa Hawkeyes Christmas shirt:sonus) normally refers to airborne vibrational waves of frequencies within the human hearing range – or the range of some animal’s hearing – + infrasound and ultrasound. So there is both a physical and a physiological version of the definition of sound – giving rise to the discussion. Classic (Cool Grinch Iowa Hawkeyes Christmas shirt) questions sometimes get their answer as we get a better view – remember Achilleus and the tortoise. The idea of relativity helped us all to combine thinking and experience.

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