The low points in the waveform are called rarefactions, and they are where the air particles are more spread out and not bouncing around as much, and thus have a lower pressure.
波形中的低点称为稀疏点，此处的空气粒子更加分散， 不会反弹太多，因此压力较低。
rarefaction
/ˌreərəˈfækʃən/ /ˌrɛrəˈfækʃən/
英汉-汉英词典
n. 变稀薄,稀薄
形容词: rarefactive
词组 | 习惯用语
rarefaction wave 稀疏波；膨胀波；余波
原声例句
科技智慧坊
英语百科
Rarefaction
Rarefaction is the reduction of an item's density, the opposite of compression. Like compression, which can travel in waves (sound waves, for instance), rarefaction waves also exist in nature. A common rarefaction wave is the area of low relative pressure following a shock wave (see picture).
近义、反义、联想词
近义词
n.concentration
联想词
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