What is Lel and Hel?

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Tags

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