While you can use an internal combustion engine to burn hydrogen, you can't use the same sort of engine you use to burn gasoline. Gasoline is a liquid, heavier than air, not stored under compression, and requires a different fuel/air mix. If you think you can replace one with the other, I have an experiment for you. Find a way to hold a glass that can alternatively hold water or helium. Of course, the answer is you can't. If you hold the glass upright, the helium floats out. if you hold it upside down, the water falls out. You need different machines to burn hydrogen to account for those physical traits.
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It might be inefficient, but at least I wouldn't need 64 bucks to fill up my entire tank for a week.
You're right. It would cost infinity dollars a week. For every point of energy you put in, you're getting .8 out.
Think about it like this. An engine takes stored energy (gasoline, diesel, electricity), then converts it into mechanical motion. So if you have say 10 'points' of energy in your gas tank, you lose a little to other things but it converts to 8 points-worth of movement.
The hydrogen car idea costs 11 points to separate the hydrogen and oxygen (from where? Battery, I guess.) From that you get 10 points of energy in hydrogen. You burn 6 points to move the car forward, lose 2 points to inefficiency, then put those remaining 2 points around to splitting hydrogen which gets you 1 point of energy and ... it dies.
That's the point. If you are putting in more energy then you're getting out, that is inefficient. It's also unworkable. That energy you're getting from burning the hydrogen is the *exact same* amount of energy you'd have to spend to split it, except that you're losing energy to things like heat, and ultimately your goal i to actually have some energy left over to move the car. But you can't -- all your energy goes back into separating more hydrogen. There's none left over.
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Using the same reasoning that you have brought up Katisara, what would happen if I were to take the battery out of your car and then asked you to start it?
Ah, that's not what I asked. I said *once it is started*. I'm willing to accept you need a jump to start any hydrogen machine. That's a given. If you were to run out the battery *while the car was already running* my car would continue to run as long as they're fuel in the tank. It generates its own electricity from the burning of diesel. And this is why people need jumps to START their car, but never to keep it running (your car won't die on the road from the battery dying, it just won't start again).