If gasoline turns from liquid to a high pressure gas

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SUMMARY

The discussion focuses on the operation of internal combustion engines using hydrogen fuel, specifically referencing the BMW hydrogen car. It emphasizes that the key factor is the chemical reaction of hydrogen combusting into water (H2O), rather than the phase transition from liquid to gas. The combustion heat generates gas expansion, which is crucial for engine work generation, described by the equation Q=m Cp del T + del (PV). The ideal work done by the engine is calculated using the integral W= Int (V_int to V_final) P dV.

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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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