Pyrolysis refers to which process in solid fuels before ignition?

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Multiple Choice

Pyrolysis refers to which process in solid fuels before ignition?

Pyrolysis is the thermal decomposition of a solid fuel into volatile gases as heat is applied, occurring before ignition. As the fuel heats, its chemical bonds break and release flammable vapors (the gases) that can burn when they reach an ignition source. The solid left behind becomes char and may burn later. This is different from melting, which is a physical change to a liquid, and from simply absorbing heat, which describes energy transfer rather than the chemical change itself. It also doesn’t involve releasing oxygen.

Pyrolysis is the thermal decomposition of a solid fuel into volatile gases as heat is applied, occurring before ignition. As the fuel heats, its chemical bonds break and release flammable vapors (the gases) that can burn when they reach an ignition source. The solid left behind becomes char and may burn later. This is different from melting, which is a physical change to a liquid, and from simply absorbing heat, which describes energy transfer rather than the chemical change itself. It also doesn’t involve releasing oxygen.

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