What is the difference between compression and rarefaction?

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Tags

1. #where
2. #rarefactions
3. #esact
4. #rarefaction
5. #furthest
6. #troughs
7. #longitudinal
8. #instead
9. #compressions
10. #apart
11. #region
12. #waves
13. #however
14. #closest
15. #compression
16. #together
17. #crests
18. #particles