Anyway "ping" already has some well established (and very specific) meaning in the computer world. I'm surprised Apple would choose that specific word for their newest gimmick. Especially since it is already loaded with such uncool, geeky history.
You can also put some pure hydrogen in a more solid container with not chance of a leak introducing oxygen, rig up a spark plug or something, and nomatter how hard you try, it won't go off unless there is a leak for air to get in.
Same thing goes for gasoline. Put some in a bowl and light it on fire and you get a nice slow flame. Get some gasoline vapors and mix them with stoicheometric amounts of oxygen and you will get an explosion.
There's more to combustion than just thermodynamics, kinetics matters too.
I agree with you about the hydrogen powered car having lots of issues though.
Work is the crab grass in the lawn of life. -- Schulz