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vipa123

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How much energy could possibly be stored in one of those containers? Enough to drive a car 100km? (talk about range anxiety...)

I ask because I know that Hydrogen has terrible energy density per unit of volume, even at scary high levels of pressure (Google says 5.6 MJ/L for compressed hydrogen gas at 700 bar pressure). Compare that with gasoline which is 32 MJ/L (To be clear, I'm not advocating for gasoline as storage medium of energy, just showing the contrast).

For some password hardening I take a short random password I already have memorized like abc1oktt and then use my own phonetic change... For example, That one becomes ehbesee1ohcayteaTea... For my master password I take three different of these and just concatenate them together to make a nice long passphrase... Not for everyone, I'm sure. But for me it essentially reinforces and reuses passwords I've known for 25 years... I also convert numbers like SSN or phone with a similar poor cipher... Nein,Ate,Sefen etc..

I am not an expert at this, but if I had to guess I would agree with your answer. Helium, even neutron enriched radioactive helium -if there is such a thing-, will evaporate into the air instantly, it will also rise to highest location being lighter than essentially every other atmospheric gas. This make it easy collect, contain, or cleanse, if performed. It will also rise above the atmosphere and get blown away by the solar winds should it escape the building. Additionally, helium is inert so it will not form other chemical compounds that will stay around, or enter the human body. Also because it is inert your body will not generally absorb it, certainly not like it would tritium water. Also comparing to water, helium will not dissolve other chemicals, radioactive or not, into it like water does. One last thing is the cooling potential of liquid helium is immense, being able to absorb massive amounts of heat during evaporation. Assuming they want to use a helium refrigeration cycle.

Fingers crossed I got some of this right...