They probably realized that sound was a wave propagating through the air and may have had a notion of the compressibility of air during sound propagation.
他们可能意识到声音是通过空气传播的波，并可能有声音传播时空气压缩的概念。
From both theoretical and experimental research, the damage effect and propagation law of blast wave for small thermo-baric warhead explosives in air are discussed in this paper.
本文从理论和实验两方面对小型温压弹的冲击波的传播规律以及杀伤效应进行了研究。
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