11.   He also promoted the research and development of fuel cells that power vehicles on pure hydrogen and produce only water vapor as their emissions.

12.   Hydrogen is combined with oxygen from the air in a chemical reaction that produces electricity that powers the vehicle.

13.   Increasing numbers of manufacturers also are offering the public hybrids that save fuel with an electric motor that helps the gasoline engine power the vehicle.

14.   Today, I am writing about the jet engine, and about how cooking fuel can power a vehicle at supersonic speeds.

15.   Water-based fuel powers vehicles.

16.   The hydrogen is used to create electricity to power the vehicle.