If gasoline turns from liquid to a high pressure gas

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Internal combustion engines can run on hydrogen by utilizing the chemical reaction where hydrogen combusts to form water (H2O). The process involves combustion heat, which converts the hydrogen gas into a high-pressure state, allowing for engine expansion. This expansion generates work, as described by the equation Q=m Cp del T + del (PV). The work done by the engine can be expressed through the integral W= Int (V_int to V_final) P dV, illustrating how pressure-volume changes contribute to engine efficiency. Understanding these principles is crucial for optimizing hydrogen as a fuel source in internal combustion engines.
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in internal combustion engines, how do they run hydrogen in these engines like the BMW hydrogen car when hydrogen combusts into H2O?
 
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Its not about the phase transition but the chemical reaction that makes it work.
 
Combustion heat makes the gas which is introduced into the engine expansion. At that moment the engine generates work. Q=m Cp del T + del (PV). And del (PV) makes work. Ideal work is like this.
W= Int (V_int to V_final) P dV
 
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