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tpaige12 tpaige12
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6 years ago
Upper flammable range refers to the
 
  a. range of vapor having a concentration less than a known percentage by volume in air that will not burn.
  b. range of vapor having a concentration greater than a known percentage by volume in air that will not burn.
  c. minimum concentration or percentage by volume in air that the substance will burn.
  d. rich mixture.
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