凡是有声波存在的空间都叫做声场,产生声波的物体通称发声体。声场中的空气由于受到声波的作用而使局部气压出现涨落,这种变化用均方根值来表示就叫做声压。声压的大小决定了声音的强弱,它跟发声体的振幅完全对应。声压的单位叫Pa(帕)或μbar(微帕),1Pa等于10μbar。人的耳朵最低能听到 Where there is room for sound waves are called sound field, sound waves generated objects known as the sound body. Sound in the sound field due to the role of sound waves and local pressure fluctuations, this change is expressed as the root mean square value called sound pressure. The size of the sound pressure determines the strength of sound, which corresponds exactly with the amplitude of the sounding body. The unit of sound pressure is Pa (Pa) or μbar (Pa) and 1 Pa equals 10 μbar. The ear of man can hear at least