跟读练习: What is Nuclear Fusion? | Fusion Power Explained | Nuclear Fusion Reaction in Sun | Dr. Binocs Show - 通过YouTube学习英语口语
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Sticking those two same ends of magnets together is next to impossible little kitty Yeah,
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Sticking those two same ends of magnets together is next to impossible little kitty Yeah,
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I just wanted to see what happens
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if I force them really close Like what if they suddenly snap together and release energy Oh wow little kitty,
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that's actually a great way to begin understanding nuclear fusion,
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one of the most powerful processes in the universe.
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Really?
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What's that?
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Let's find out together by answering the question.
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What is nuclear fusion?
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Zoom in!
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At its core, nuclear fusion is the process by which two light atomic nuclei combine to form a heavier nucleus,
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releasing a huge amount of energy.
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This is exactly what powers the Sun and other stars.
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Every second the Sun is fusing tiny hydrogen nuclei into helium,
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producing the light and that make life on Earth possible.
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But how does it actually work?
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Atoms are made of a central nucleus containing protons and neutrons, surrounded by electrons.
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The key players in fusion are the nuclei,
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especially those of hydrogen isotopes like deuterium and tritium.
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These nuclei are positively charged,
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which means they naturally repel each other, just like the magnets.
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So for fusion to happen,
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we need to overcome this electrostatic repulsion.
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That's where extreme conditions come in.
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In the core of the sun,
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temperatures reach about 15 million degrees Celsius and the pressure is unbelievably high due to gravity.
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Under these conditions, particles move incredibly fast.
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When hydrogen nuclei collide at such high speeds,
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they can get close enough for another force,
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the strong nuclear force, to take over.
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This force is much stronger than the repulsion,
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but it only works at very tiny distances.
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Once the nuclei are close enough,
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they snap together and fuse.
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When fusion happens, something interesting occurs.
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The mass of the new nucleus is slightly less than the combined mass of the original nuclei.
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That missing mass is not lost, it's converted into energy.
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According to Einstein's famous equation,
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E is equal to mc2.
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Because the speed of light squared c2 is such a huge number,
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even a tiny amount of mass produces an enormous amount of energy.
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On Earth, scientists are trying to recreate this process.
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But without the Sun's gravity,
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we need other methods to achieve the same extreme conditions.
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One approach uses magnetic confinement where superheated gas called plasma is
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trapped using powerful magnetic fields inside a donut shaped device called tokamak.
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Another method uses high powered lasers to compress and heat tiny fuel pellets in a fraction of a second.
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The biggest challenge is achieving something called ignition,
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the point where the fusion reaction produces more energy than it consumes.
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In December 2022, scientists made a major breakthrough in nuclear fusion.
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At a facility in the United States,
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they used powerful lasers to trigger a tiny fusion reaction that produced more energy than it used.
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Although the reaction lasted only a fraction of a second,
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it proved that controlled fusion is possible and brought us one step closer to using it as a real energy source.
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Despite the remaining technical challenges, fusion has incredible potential.
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It uses fuels like hydrogen,
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which can be extracted from water,
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and it produces very little long-term radioactive waste compared to nuclear fission,
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which is a process of splitting heavy nuclei.
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If we can make it work efficiently,
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fusion could provide a nearly limitless clean source of energy.
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Trivia time!
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Did you know every atom in your body,
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heavier than hydrogen, was created inside the nuclear fusion furnace of a time star,
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billions of years ago?
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Yes, like the carbon in your muscles and the calcium in your bones are made of star stuff.
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It's sketching time.
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Today's sketch of the day goes to Amoni Ratnaya.
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Hope you learnt something really academic today.
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Until next time, it's me Dr. Binox, Zooming out.
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So Kitty, I hope you understand what nuclear fission is.
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Um, I think they should call it nuclear confusion instead.
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Oh, never mind.
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语法和表达的语境分析
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常见发音陷阱
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