characteristic velocity

例句：

1. 1. The characteristic velocity ofthe gas is determined by its molecular weight.
   气体的特征速度由其分子量决定。
2. 2.The characteristic velocity of sound in air isapproximately 343 meters per second.
   声音在空气中的传播速度约为每秒343米。
3. 3. The characteristic velocity of lightin a vacuum is about 299,792 kilometers per second.
   光在真空中传播的速度约为每秒299,792公里。