füüsika haru, mis tegeleb gaasides, vedelikes ja tahketes ainetes mehaaniliste lainete uurimise ja mõõtmisega, sealhulgas selliste teemadega nagu vibratsioon, heli, ultraheli ja infraheli
branch of physics that deals with the study of mechanical waves in gases, liquids, and solids including topics such as vibration, sound, ultrasound and infrasound
