What is critical mass in physics?

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Tags

1. #fission
2. #critical
3. #under
4. #amount
5. #conditions
6. #material
7. #given
8. #stated
9. #nuclear
10. #achieve
11. #minimum
12. #necessary
13. #fissile
14. #chain
15. #reaction
16. #sustaining
17. #physics