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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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    David Chapman‏ @Meaningness 20 Aug 2018
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    Very roughly how many water molecules would you guess there are in a single cell? Within a couple of orders of magnitude? I got it quite wrong.

    10:54 AM - 20 Aug 2018
    • 8 Retweets
    • 24 Likes
    • BCK Volatility Robert E. P. Levy The Dark Matrix Timothy #masks4all Roy software mechanic Tequehead El Ojo del Milenio zing mud chandelier Dan Joyce
    30 replies 8 retweets 24 likes
      1. New conversation
      2. David Chapman‏ @Meaningness 20 Aug 2018
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        I guessed off-hand “a billion” which I think was just my brain’s way of saying “wow, a really big number!” But it’s WAY too small.

        3 replies 0 retweets 7 likes
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      3. David Chapman‏ @Meaningness 20 Aug 2018
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        There’s a bunch of different numbers you can find on the web. Some of them are definitely way off. But there’s a wide range of values that seem reasonable (to me) because cells vary in size over several orders of magnitude.

        2 replies 0 retweets 3 likes
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      4. David Chapman‏ @Meaningness 20 Aug 2018
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        You can do a Fermi estimate based either on mass (which didn’t occur to me, but several tweeps did it that way!) or based on volume. https://en.wikipedia.org/wiki/Fermi_problem …

        0 replies 0 retweets 6 likes
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      5. End of conversation
      1. New conversation
      2. Agile Hulk‏ @Agile_Hulk 20 Aug 2018
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        Replying to @Meaningness

        I guessed a trillion, but only because you said you got it wrong. Then I calculated that a red blood cell weighs about 1.6 trillion times as much as a water molucule, so I'm pretty confident.

        1 reply 0 retweets 1 like
      3. David Chapman‏ @Meaningness 20 Aug 2018
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        Replying to @Agile_Hulk

        Yes; they’re very small for human cells, though. Add an order of magnitude or two to get a typical-sized one.

        1 reply 0 retweets 2 likes
      4. 4 more replies
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      2. 𝕵𝐚𝐲𝐚𝐫𝐚𝐯𝐚‏ @Jayarava 20 Aug 2018
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        Replying to @Meaningness

        Twitter has made it very unclear whether you answered the question or not. I see various threads, but nothing clear.

        1 reply 0 retweets 0 likes
      3. David Chapman‏ @Meaningness 20 Aug 2018
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        Replying to @Jayarava

        David Chapman Retweeted David Chapman

        There should only be one main thread! Twitter sucks. I get 10^14:https://twitter.com/Meaningness/status/1031636209565687808 …

        David Chapman added,

        David Chapman @Meaningness
        So call it 30μ, i.e. 3*10^-5. Then the ratio of linear dimensions is 10^5, or volumetrically 10^15. But water isn’t the whole of the cell, so less than that. Maybe 10^14. This is larger than most numbers I found on the web, but not way off.
        Show this thread
        1 reply 0 retweets 1 like
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      2. Fool Pelt‏ @reweirding 20 Aug 2018
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        Replying to @Meaningness

        A million?

        1 reply 0 retweets 1 like
      3. Fool Pelt‏ @reweirding 20 Aug 2018
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        Replying to @reweirding @Meaningness

        Million Billion?

        1 reply 0 retweets 1 like
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      2. 𝕵𝐚𝐲𝐚𝐫𝐚𝐯𝐚‏ @Jayarava 20 Aug 2018
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        Replying to @Meaningness

        Well Avogadro's no is 6 x 10^23. A mol of water (18 g) would contain that many. A cell would be perhaps 10^-6 of a g. So Maybe around 10^17 or 10^18 if it were pure water. Most of the actual water in the body is in fluids, not cells. So somewhere between 10^15 and 10^16?

        5 replies 0 retweets 8 likes
      3. Derek. JUST "Derek. JUST "Derek. JUST "Derek. JUST‏ @PereGrimmer 20 Aug 2018
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        Replying to @Jayarava @Meaningness

        I said ~10^15 for roughly the same reason. (Also because my snap judgment was 10^9 then I way overcorrected to 10^25 then did some thinking and it seemed decent enough.)

        0 replies 0 retweets 5 likes
      4. End of conversation

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