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Meaningness's profile
David Chapman
David Chapman
David Chapman
@Meaningness

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David Chapman

@Meaningness

Better ways of thinking, feeling, and acting—around problems of meaning and meaninglessness; self and society; ethics, purpose, and value.

meaningness.com/about-my-sites
Joined September 2010

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    1. David Chapman‏ @Meaningness 19 Jun 2019
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      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

      3 replies 10 retweets 74 likes
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    2. David Chapman‏ @Meaningness 19 Jun 2019
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      I mean how hard could it be to measure pH? Turns out there are two (or more) types of meters that work on entirely different principles. That they are measuring the same thing depends on masses of theory and experimental confirmation that the user doesn’t know anything about.

      2 replies 2 retweets 21 likes
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    3. David Chapman‏ @Meaningness 19 Jun 2019
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      It appears to be literally true that no one knows how the better type works. They use a “glass electrode” that is semipermeable to hydrogen ions. The nature of the electrode is a closely-guarded trade secret and they appear to be discovered by trial and error, not theory.

      2 replies 3 retweets 33 likes
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    4. David Chapman‏ @Meaningness 19 Jun 2019
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      pH meters are peevish as hell and give maliciously wrong readings unless you are extremely polite to them. You have to recalibrate them before every measurement in case they are in a bad mood.

      4 replies 0 retweets 23 likes
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    5. David Chapman‏ @Meaningness 19 Jun 2019
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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.

      3 replies 0 retweets 14 likes
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      David Chapman‏ @Meaningness 19 Jun 2019
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      David Chapman Retweeted Evan Daniel

      Here’s an interesting thread from someone who actually knows what they are talking about (I assume):https://twitter.com/evanbd/status/1141540083532795904 …

      David Chapman added,

      Evan Daniel @evanbd
      Replying to @Meaningness
      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.
      8:08 PM - 19 Jun 2019
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      • Lucy Keer テイン ペーネロペー ice9 Matt Parsons 🏳️‍🌈 Mimetic Contagion The Stone that the builder refused bowser 🦾 Raymond
      2 replies 0 retweets 8 likes
        1. Evan Daniel‏ @evanbd 19 Jun 2019
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          Replying to @Meaningness

          I will claim to know what I'm talking about only in that I have plenty of experience yelling at them and buying replacement electrodes. My electrochemistry skills are adequate to maintaining an industrial anodizing line, but not to *understanding* a pH meter.

          0 replies 1 retweet 3 likes
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        2. Alex 2.0‏ @Player518214 19 Jun 2019
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          Replying to @Meaningness

          I used to use them for chemical weapons testing (long story, not especially relevant): I found Omega to be a) the most reliable and b) the most helpful. https://www.omega.co.uk/prodinfo/ph-meter.html# …

          1 reply 0 retweets 0 likes
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