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From: D <nospam@example.net>
Newsgroups: comp.os.linux.misc
Subject: Re: Remember "Bit-Slice" Chips ?
Date: Mon, 9 Dec 2024 10:49:48 +0100
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On Sun, 8 Dec 2024, Rich wrote:

> D <nospam@example.net> wrote:
>>
>> What about storing it as water, and producing it close to where cars need
>> to be fueled up? I assume it would be very inefficient and probably
>> difficult, or else someone would already have done it. But I do not know
>> any specifics, so just genuinely curious.
>
> Hydrogen can be stored very safely as water.  The earth's covered in a
> significant amount of "water stored hydrogen". :)
>
> The tricky part is you have to put in a rather significant amount of
> energy to convince it (the hydrogen) to let go of it's grip with the
> oxygen atoms that make up the water.
>
> And once you create it, and pump it into the car's pressure tank
> (you'll need a pressure vessel unless the car has a cryo-cooler on
> board, and the energy expended by the cryo-cooler would dwarf the
> energy needed to propel the car), you are right back to the
> 'embrittlement' problem again.
>
> And consider the explosive force stored in a 350-700 bar (your
> AI's number) pressure vessel that becomes brittle enough to go "bang".
> That's one hell of a bang, even without the hydrogen itself explosively
> combusting as part of the pressure release.
>
> Plus, the walls of the pressure vessel quite effectively become a
> 'fragmentation grenade' in the process of going bang.

But how is this solved in existing hydrogen cars? Hydrogen cars exist, so 
surely they must have some way to at least mitigate this problem?

As for converting hydrogen "on site" I can imagine two limiting factors.

1. The speed of conversion. Can you convert hydrogen on site, fast enough, 
to fill up a car in 5-10 minutes?

and

2. The cost of converting water to hydrogen in a smaller setup, vs doing 
it somewhere central and shipping it.