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Cake day: June 15th, 2023

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  • user134450@feddit.detoich_iel@feddit.deich🏴‍☠️iel
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    3 months ago

    In der Praxis gab es keine richtige Abgrenzung zwischen Kaperfahrt und Piraterie; siehe z.B: Klaus Störtebecker wird von vielen nur als Pirat gesehen obwohl er lange Zeit legal gesehen ein Kaperfahrer war.

    Eine Kaperfahrt ist ganz eindeutig mit einer staatlichen (über)Macht zu identifizieren.


  • Other commenters have pointed out the problems with overloading of connectors and reduced efficiency because of the added resistance but there is another really important reason not to chain power strips: circuit breakers work best against short circuits when the resistance between the breaker and the short is fairly low (for instance less than 0.5Ω) so that the current will quickly go over the rated current of the breaker. If the resistance is a lot higher because you have too many extensions between the breaker and the fault, the time the breaker needs to react will go up. Counterintuitively this usually means more energy will be turned to heat by the fault.

    In extreme cases this can mean the difference between a broken power strip that you can just throw out and a burned down house.






  • user134450@feddit.detoCoffee@lemmy.worldDescaling liquid
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    4 months ago

    If you want to be super exact about it it would be roughly 4 times the mass of limescale + mass of already dissolved CaCO3 in your tap water (you can look that up if you know the hardness index of your water).

    But really just don’t be stingy with citric acid and it will be fine is what i am saying.

    Here is the math:

    Spoiler

    2 frac {210.14 g/mol } {100.0869 g/mol} approx 4.2

    <math xmlns=“http://www.w3.org/1998/Math/MathML” display=“block”> <semantics> <mrow> <mn>2</mn> <mrow> <mfrac> <mrow> <mn>210.14</mn> <mrow> <mi>g</mi> <mo stretchy=“false”>/</mo> <mi mathvariant=“italic”>mol</mi> </mrow> </mrow> <mrow> <mn>100.0869</mn> <mrow> <mi>g</mi> <mo stretchy=“false”>/</mo> <mi mathvariant=“italic”>mol</mi> </mrow> </mrow> </mfrac> <mo stretchy=“false”>≈</mo> <mn>4.2</mn> </mrow> </mrow> <annotation encoding=“StarMath 5.0”>2 frac {210.14 g/mol } {100.0869 g/mol} approx 4.2</annotation> </semantics> </math>


  • user134450@feddit.detoCoffee@lemmy.worldDescaling liquid
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    4 months ago

    Note that citric acid works a bit more nuanced than many other descalers: it acts as a chelating agent at high concentrations (2x the Ca2+ concentration) and is more effective at removing scale because of this effect, but at lower concentrations the effect might actually be reversed because it can form solid calcium citrate, which has a very low solubility in water.

    If you are using citric acid based descaler you should make sure that you are always using enough of it to avoid the formation of calcium citrate.