What is compression and rarefaction?

Related questions

1. What's the difference between lossy and lossless compression?
2. What is block compression?
3. What is lossless image compression?
4. What is bzip2 compression?
5. What causes compression and rarefaction?
6. How does a file get compressed?
7. What compression algorithm does zip use?
8. Why do people use lossless compression?
9. What is the filename extension for the bzip2 compression program?
10. Is lossy or lossless compression better?

Tags

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