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What is the scientific explanation of why a hydrogen-powered car works?

Question by David Ortiz: What is the scientific explanation of why a hydrogen-powered car works?
We are doing a hydrogen-powered car for a sciende fair next week and we would like to know scientifically, why does the hydrogen car works. Like what does it react that makes the car work.

Here’s a link to a similar hydrogen car, like the one we are doing:

http://www.youtube.com/watch?v=cWciYN1hcj4

Best answer:

Answer by gary m
H2(gas)+O2=energy

Know better? Leave your own answer in the comments!