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This, like the Fourier Transform webpage, is a masterpiece.

Silly Question: when I add gasoline to my car it's a liquid. When it enters a cylinder of my Engine, mixed with air, is it still a liquid? Is it a gas? Aeresolized? What causes the change in state and when/where?

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It’s an aerosol, fine droplets of liquid in a stream of air. It used to be the carburetor that added the fuel to the airstream (by way of the Bernoulli principle); modern cars use a fuel injector, which works on much the same principle as a spray bottle to create the fuel-air mixture directly in the cylinder.

Can you share a link to the Fourier Transform page that you mentionted, please?

https://www.jezzamon.com/fourier/

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