Hi Likely a stupid question. If atoms vibrate with heat, why don't hot objects make a sound, i.e transferring vibrations to the surround atoms (air) into our eardrums? They vibrate on ultra-infra sound? Or it's a extremely weak sound? or this is not the same vibration as the cause for sound? or they vibrate chaotically and interfering? Googling led me to news about "listening" to atoms vibrations but that doesn't really answer this! Thanks!