Is hardness a chemical or physical property?

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Tags

1. #changing
2. #general
3. #properties
4. #examples
5. #substance
6. #corrosion
7. #physical
8. #color
9. #resistance
10. #density
11. #oxidation
12. #chemical
13. #identity
14. #observed
15. #flammability
16. #those
17. #without
18. #hardness
19. #matter