The concept is called thermoacoustic refrigeration -- using sound waves to cool something. The technology offers several advantages over conventional cooling systems, says a Purdue University engineer ...

Beautiful Relaxing Nature Sounds of Waves ... great relaxing music to come! How to meditate? How to relax? Just imagine to be in the deep green of the nature with the calming sound of water ...

trumpet the sound from the trumpet comes from a vibrating column of air created by buzzing lips of the trumpeter A sound wave is a longitudinal ... as is loud music played from a smart speaker ...