Arfa Daily wrote:
That seems to me to be a misleading description of the principles of an
internal combustion engine. The fuel is mixed with the air in a very
carefully controlled ratio, highly compressed, and is then set light to,
either by a spark in the case of a gasoline engine, or by self ignition from
the rapid heating of the mixture during compression, in the case of a
diesel. It burns or combusts, and what comes out of the exhaust, after the
burning, is not air, but a fully reduced residue of the burning process.

To add to your excellent explanation, the byproducts of combustion, such
as carbon dioxide, together occupy more volume than the fuel-air mixture
did, and the heat generated by the rapid burn further increases the total
volume.

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