音速(粵拼:jam1 cuk1),又叫聲速(sing1 cuk1,部分鄉下地區讀seng1 cuk1),係聲音嘅速度,定義喺每單位時間入面,振動波傳遞嘅距離。
喺舊標準狀況下,聲音喺空氣裡面嘅速度係340米/秒。
音速c嘅大細都有佢哋嘅公式:
一般嘅狀態方程式(經典力學適用範圍入面):
遠離液態工作點嘅理想氣體:
實用經典公式:
喺流體入面時:
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