Is Rarefaction and Compression Related to Changes in Density?

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The terms "rarefactive" and "compressive" are debated in the context of discussing changes in density. Some participants suggest that "rarefied" and "compressible" are more accurate terms to use. The discussion highlights the importance of precise language in scientific contexts. Clarity in terminology can enhance understanding of concepts related to density changes. Accurate pronunciation and terminology are essential for effective communication in scientific discussions.
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Just some pronunciation...
"The medium was rarefactive or compressive"
Is that the right way to say it?
 
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I think you should say "rarefied", and "compressible"
 
Thread 'What is the pressure of trapped air inside this tube?'

Thread 'What is the pressure of trapped air inside this tube?'

As you can see from the picture, i have an uneven U-shaped tube, sealed at the short end. I fill the tube with water and i seal it. So the short side is filled with water and the long side ends up containg water and trapped air. Now the tube is sealed on both sides and i turn it in such a way that the traped air moves at the short side. Are my claims about pressure in senarios A & B correct? What is the pressure for all points in senario C? (My question is basically coming from watching...
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