rarefactions 

  1. 名詞
rarefaction複數: (氣體等的)稀薄
(聲音等的)稀疏
純凈

    
                        
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例句

                

                    
    
                                                    
  1. 
                                A sound wave propagating underwater consists of alternating compressions and rarefactions of the water.                            
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                                These compressions and rarefactions are detected by a receiver, such as the human ear or a hydrophone, as changes in pressure.                            
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                                QUESTION: The compressions and rarefactions of sound waves generate adiabatic temperature fluctuations in the medium (take air).                            
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                                The driver mounted in a resonant cavity exhibits behavior akin to "cavitation" in which a series of gas pressurizations and rarefactions oscillate back and forth in a captive state.                            
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                                For instance, our historical understanding about "sound", "light" and "heat" have today been reduced to "wave compressions and rarefactions ", "electromagnetic waves", and "molecular kinetic energy", respectively.                            
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