What is LEL UEL?

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Tags

1. #lower
2. #contact
3. #combustible
4. #oxygen
5. #itself
6. #spark
7. #below
8. #value
9. #explained
10. #concentration
11. #required
12. #limit
13. #explosive
14. #combustion
15. #minimum
16. #between
17. #specific
18. #gases