Even if the enthalpy remains the same, the entropy might change in a process, and the free energy as well.
I found this page: http://www.waterfuelcell.org/ (english) which also describes a car powered by water. There are videos and 'technical' details of how it's supposed to work. But I still think watercars are fake.
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Bubble signals with letters will bring a new era of communication.
Even if the enthalpy remains the same, the entropy might change in a process, and the free energy as well.
I found this page: http://www.waterfuelcell.org/ (english) which also describes a car powered by water. There are videos and 'technical' details of how it's supposed to work. But I still think watercars are fake.