声速
声速，又称“音速”（每秒340 米，每小时1224千米），顾名思义即是声音个速度，定义为单位辰光内振动波传递个距离。声速（波传递个速度）搭传递介质个材质状况（密度、温度、压力等）有绝对关系，而搭发声者（波源）本身个速度无关，而发声者（波源）搭听者（观察者）间假使有相对运动关系，就形成了多普勒效应。
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