I accidentally fell down a deep rabbit hole while trying to figure out how pH meters work. I thought this would be a really nice simple example of a scientific instrument, suitable for didactic explanation as part of an exposition of the failures of logical positivism. FAIL
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I tapped out while trying to understand a long, vitriolic, hyper-technical argument about whether pH meters actually measure H+ (per the undergrad definition) or H3O+ (which is what you get in aqueous solution) and whether it matters.
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Here’s an interesting thread from someone who actually knows what they are talking about (I assume):https://twitter.com/evanbd/status/1141540083532795904 …
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I was reading about this in preparation for indigo dying - opted for churched-up litmus paper & faith in error tolerance
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Hey I found some wild Indigo growing near my house. Can this be used to make dye?
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And they exhibit both short-term and long-term weird behavior. Storing them properly can fix minor issues. The better meters store not just a recent calibration point, but a calibration *history*, which it uses in some silent and undisclosed fashion.
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And you can wipe said history if it's getting too peevish. Sometimes it helps. Store it in the special fluid. What fluid? Well, that depends on the measurements you're normally taking.
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I always found that annoying in high school but assumed it was because we had shitty instruments or I was using them wrong, and that a perfect pH meter existed
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