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DanielleFong's profile
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Empire of the Future
Joined February 2008

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    1. Michael Nielsen‏ @michael_nielsen 24 Jan 2021

      Still: many chemical reactions occur relatively easily. While things like fission are actually rather difficult to cause (fortunately!) And I don't understand the underlying physical reasons for the difference very well.

      1 reply 0 retweets 8 likes
      Show this thread
    2. Michael Nielsen‏ @michael_nielsen 24 Jan 2021

      One possible reply - sort of begging the question - is to say "well, the energies involved are much larger". This is true, but not terribly helpful. Why are they so much larger?

      1 reply 0 retweets 8 likes
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    3. Michael Nielsen‏ @michael_nielsen 24 Jan 2021

      It's tempting to say: well, the strong nuclear force that binds the nucleus is very, very strong, and that makes the energy scales involved very large compared to a chemical reaction. Again: true, but I guess a much better & deeper answer is possible!

      12 replies 0 retweets 16 likes
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    4. Michael Nielsen‏ @michael_nielsen 24 Jan 2021

      Michael Nielsen Retweeted Paul Simeon

      Good thread discussion with @PESimeon. Certainly deepened my understanding:https://twitter.com/PESimeon/status/1353531815336665088 …

      Michael Nielsen added,

      Paul Simeon @PESimeon
      Replying to @michael_nielsen
      Nuclei are “shielded” by their mutually repulsive electric charges. That’s why it takes high energy to initiate fusion reactions.
      2 replies 0 retweets 21 likes
      Show this thread
    5. Michael Nielsen‏ @michael_nielsen 24 Jan 2021

      Many anthropic replies, of the form "Well, if they weren't hard, we wouldn't exist". I'm looking for something stronger & more informative than an anthropic explanation. Funny: anthropic e's are a bit like evolutionary just-so stories: v often possible, often not so informative

      3 replies 0 retweets 10 likes
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    6. Michael Nielsen‏ @michael_nielsen 24 Jan 2021

      Michael Nielsen Retweeted Michael Nielsen

      Another framing of the question:https://twitter.com/michael_nielsen/status/1353554665221148672 …

      Michael Nielsen added,

      Michael Nielsen @michael_nielsen
      Replying to @michael_nielsen @Cosmic_Horizons
      Another framing: suppose there was a paragraph in the Feynman lectures beginning: "We use chemical reactions routinely, when we cook, breathe, and so on. But nuclear reactions are less ubiquitous, and we think of them as requiring special conditions. The reason is [???]"
      1 reply 0 retweets 8 likes
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    7. Michael Nielsen‏ @michael_nielsen 24 Jan 2021

      Michael Nielsen Retweeted Geraint F. Lewis

      Fun related thread from @Cosmic_Horizons here:https://twitter.com/Cosmic_Horizons/status/1349888514544996354 …

      Michael Nielsen added,

      Geraint F. LewisVerified account @Cosmic_Horizons
      Physics question: During nuclear fission, either in an atomic bomb or a nuclear reactor, which *force* is responsible for the huge amount of energy that is released?
      Show this thread
      3 replies 1 retweet 9 likes
      Show this thread
    8. Michael Nielsen‏ @michael_nielsen 24 Jan 2021

      Michael Nielsen Retweeted

      Great implied question here. One version of the question: is the rate at which atoms on Earth are involved in chemical reactions higher or lower than the rate at which atoms in the Sun are involved in fusion? [I suspect higher, based on ~30secs thought] https://twitter.com/DavidSchaengold/status/1353549367043444737 …

      Michael Nielsen added,

      This Tweet is unavailable.
      5 replies 0 retweets 13 likes
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    9. Trevor Blackwell‏ @tlbtlbtlb 25 Jan 2021
      Replying to @michael_nielsen

      The answer is: ratio of chemical to fusion energy > fraction of sun's light that hits earth. Fusion in the sun releases 3e6 eV per new helium, and assume 1 eV for chemical. Earth gets around 1/2e9 of the sun's energy. So more nuclear.

      1 reply 0 retweets 1 like
    10. Trevor Blackwell‏ @tlbtlbtlb 25 Jan 2021
      Replying to @tlbtlbtlb @michael_nielsen

      Although there are a lot of very low-energy chemical reactions in biology.

      1 reply 0 retweets 1 like
       🤷🏻‍♀️‏ @DanielleFong 25 Jan 2021
      Replying to @tlbtlbtlb @michael_nielsen

      1/2e9 though, that’s a steep factor to overcome. clearly more nuclear, still

      12:40 AM - 25 Jan 2021
      0 replies 0 retweets 0 likes

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