1.   A fuel cell in the vehicle would combine the hydrogen with oxygen through an electrochemical process, without combustion.

2.   But Chrysler and others are also looking into fuel cells, devices that make current by combining hydrogen carried on board with oxygen from the air.

3.   That is, if electricity causes water to split into hydrogen and oxygen, then combining hydrogen with oxygen creates electricity.

4.   The microbes combine the hydrogen with carbon dioxide in the water to make organic compounds.

5.   A fuel cell produces energy from a chemical reaction when hydrogen is combined with oxygen.

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

7.   The technology generates electricity by combining hydrogen stored in the car as fuel with oxygen in the air.