Multiple choice general knowledge science & technology

What is the lower flammability limit (% vol/vol) of hydrogen in air.

  1. 0.4

  2. 3

  3. 4

  4. 8
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The lower flammability limit (LFL) of hydrogen in air is 4% by volume. Below this concentration, the mixture is too lean to burn. Options A (0.4%), B (3%), and D (8%) are incorrect - 0.4% is too low, 3% is close but not the standard value, and 8% approaches the upper flammability limit.

Keep practicing — related questions