Practice question

The flammable (explosive) range of a gas is defined by:

  1. The lower and upper flammable limits (LEL and UEL) between which the mixture can ignite
  2. Only the boiling point
  3. The specific gravity alone
  4. The pH range

Answer: A — The lower and upper flammable limits (LEL and UEL) between which the mixture can ignite

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