This Earth, the only true home i ever had and will ever have, is not my world, i’m just a passerby in here … it is yours and it is strange.

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Joined 2 years ago
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Cake day: June 13th, 2023

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  • A_A@lemmy.worldtoMildly Infuriating@lemmy.worldCall Before You Dig
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    9 days ago

    in the context : this guy wants to go to a date and he needs water now. So, for a few hours the water the in the tank is safe // if this guy has some brain - - and he looks like a very smart guy - - he will know how to handle this water. Otherwise, for stupid people : yes, your advice is good.

    For myself, i know how to sterilize water - - i don’t know about you … if you are in an emergency … in an earthquake situation … in a desperate situation … you may choose to do something special in such situations … if you think you have some survival skills.






  • A_A@lemmy.worldtoMildly Infuriating@lemmy.worldCall Before You Dig
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    9 days ago

    (( Edit :
    Boil the water before using it. Consider it under boiling advisory.
    … - - see comments below ))

    cut the electric breaker to your hot water tank so you don’t burst and an eating heating element if there is lower water level inside the tank.

    Now you can use this tank as a water supply. You take water from the bottom tap of the water tank. Let the air come inside the tank by opening another top level hot water faucet anywhere inside the home. Be careful to (carefully) refill the water tank once municipal supply goes back on.








  • … a sphere nine metres in diameter and weighing 400 tonnes will be submerged off the coast of California at a depth of 500 to 600 metres. It will have a storage capacity of 0.4 megawatt hours (400 kWh) …

    i will try a rough calculations : suppose we can have concrete at $100 per ton, then it’s a minimum investment of $40,000. Also suppose electricity is stored with a large added value of 10 cents per kilowatt hour, so, for every cycle a rough gain of $40. By these numbers, 1,000 cycles would pay for the concrete … so, it may look good considering they plan a life of about 50 years for such devices.
    On the other hand if competitive battery storage cost only one cents per kilowatt hour (temporary in and out storage) and if concrete and fabrication goes up 10 times to $1,000 per ton then it is not economically viable anymore.

    A good calculation of profitability would need to take into account the less than 100% energy efficiency of batteries cycling and of hydraulic energy cycling, … and so many more parameters which have to be studied.