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What is Pyrolysis ?

  • A.The decomposition of solid organic matter by heat
  • B.Evaporation of combustible liquids at low temperature
  • C.The red glow of hot charcoal
  • D.Burning of cigarette

Answer: A

Pyrolysis is the decomposition of solid organic matter by heat.

When a solid such as wood or plastic is heated, it breaks down chemically into volatile, combustible gases and a carbon-rich char, with little or no oxygen involved. These gases then burn in the flame. Pyrolysis is therefore the step that lets a solid fuel feed a fire, and pyrolysis-GC is used to identify polymers and paints.

Evaporation of a liquid is a physical change, the red glow of charcoal is glowing (smouldering) combustion, and the burning of a cigarette is a smouldering fire. None of these is the thermal decomposition itself.

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