Acoustics has two meanings:
(2) The acoustics of a room indicates how sound acts in a room. Acoustical engineering understand the science of acoustics and use this knowledge in designing and building structures with specific acoustics.
(1) Sound reflects (bounces back from a surface) off of hard and slick materials, such as mirrors and wooden floors and furniture. (
(2) Sound is absorbed (taken in) by soft, fuzzy materials, such as carpet, curtains and padded furniture and by rough materials, such as textured walls. Sound gets trapped in these materials because most of it bounces around in the material instead of being reflected. The trapped sound energy changes to heat energy.