托卡马克为什么要用强磁场把上亿度的聚变等离子体“关”在真空里？
Why does a tokamak use strong magnetic fields to cage 100-million-degree fusion plasma in a vacuum?
没有任何材料能直接接触上亿度的等离子体而不被汽化，所以靠环形磁场让带电粒子绕磁力线转圈、待在中心。真空则避免等离子体撞到残余气体而降温散掉。
No material could touch 100-million-degree plasma without vaporizing, so a toroidal field makes charged particles spiral along field lines and stay centered. Vacuum keeps residual gas from cooling the plasma on contact.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
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Francis F. Chen 著《Introduction to Plasma Physics and Controlled Fusion》（等离子体物理与受控聚变导论）
Francis F. Chen, Introduction to Plasma Physics and Controlled Fusion
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-306-41332-2 (2006, Plenum/Springer)
#托卡马克 #磁约束 #聚变
为什么闪电会发光？
Why does lightning glow?
云层间强大电场击穿空气，瞬间高温让空气发光发声。
A huge electric field ionizes air, heating it so it glows and thunders.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
来源 · Source
Halliday、Resnick 与 Walker，《物理学基础》（第10版）
Halliday, Resnick & Walker, 'Fundamentals of Physics' (10th ed.)
独立核验依据 · Independent verification: 核验依据 2 angusrobertson.com.au
#电 #放电 #空气
等离子体的“磁约束”和“惯性约束”两种聚变路线，差别在哪？
What's the difference between 'magnetic' and 'inertial' confinement fusion?
磁约束（如托卡马克）用磁场长时间“托住”稀薄的等离子体；惯性约束（如激光点火）则用多束激光在极短时间内把小靶丸压缩到聚变条件，靠惯性还来不及散开就反应了。一个靠“撑住”，一个靠“压炸”。
Magnetic confinement (tokamak) holds a tenuous plasma with fields for a long time; inertial confinement (laser ignition) compresses a tiny pellet in a billionth of a second so fusion happens before it can fly apart. One 'holds', the other 'squeezes'.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Francis F. Chen 著《Introduction to Plasma Physics and Controlled Fusion》（等离子体物理与受控聚变导论）
Francis F. Chen, Introduction to Plasma Physics and Controlled Fusion
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-306-41332-2 (2006, Plenum/Springer)
#磁约束 #惯性约束 #聚变
闪电那一瞬，空气其实被变成了什么状态？
In a lightning flash, what state does the air actually turn into?
强大的电场把空气分子电离，正负电荷分开乱窜，空气瞬间变成灼热的等离子体通道。正是这团发光发热的等离子体，构成了我们看到的闪电。
The huge electric field ionizes air molecules, freeing charges that race around, turning the air into a hot plasma channel. That glowing, searing plasma is the lightning we see.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Francis F. Chen 著《Introduction to Plasma Physics and Controlled Fusion》（等离子体物理与受控聚变导论）
Francis F. Chen, Introduction to Plasma Physics and Controlled Fusion
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-306-41332-2 (2006, Plenum/Springer)
#闪电 #电离 #等离子体
为什么恒星内部和霓虹灯里都有等离子体，温度却差了上亿倍？
Both star interiors and neon signs contain plasma — why do their temperatures differ by hundreds of millions of degrees?
只要原子被电离出自由电子，就算等离子体，对“温度”没有下限。霓虹灯只是温和电离、灯管凉凉的；恒星靠极高温度和压强维持完全电离，所以热到发光。是否等离子体和有多热，是两回事。
Plasma only needs freed electrons, with no minimum temperature. A neon sign is mildly ionized and stays cool; a star is fully ionized by extreme temperature and pressure, hence blazing hot. Being plasma and being hot are separate questions.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Francis F. Chen 著《Introduction to Plasma Physics and Controlled Fusion》（等离子体物理与受控聚变导论）
Francis F. Chen, Introduction to Plasma Physics and Controlled Fusion
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-306-41332-2 (2006, Plenum/Springer)
#电离度 #温度 #恒星
为什么人造核聚变要上亿度，而氢弹用化学炸药就能点燃？
Why does lab fusion need 100 million degrees, yet a hydrogen bomb ignites with chemical explosives?
氢弹靠原子弹的 X 射线和冲击波在一瞬间把燃料压缩到极高密度和温度，是“猛压”出来的。实验室里没法造原子弹当打火机，只能靠稳态磁约束慢慢把稀薄等离子体加热到上亿度。
A hydrogen bomb uses an atomic bomb's X-rays and shockwave to compress fuel to extreme density and temperature in an instant. Labs can't use a fission bomb as a lighter, so they must steadily heat tenuous plasma to 100 million degrees instead.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Francis F. Chen 著《Introduction to Plasma Physics and Controlled Fusion》（等离子体物理与受控聚变导论）
Francis F. Chen, Introduction to Plasma Physics and Controlled Fusion
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-306-41332-2 (2006, Plenum/Springer)
#氢弹 #压缩 #聚变
等离子体为什么被称为物质的“第四态”？
Why is plasma called the 'fourth state' of matter?
给气体不断加热或加电，电子会被扯离原子，变成一群带正电的离子和自由电子混在一起——这团“带电雾”就是等离子体，和固液气都不同，所以算第四态。
Heat or energize a gas enough and electrons rip free from atoms, leaving a mix of positive ions and free electrons — an electrified 'fog' unlike solid, liquid or gas, hence the fourth state.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Francis F. Chen 著《Introduction to Plasma Physics and Controlled Fusion》（等离子体物理与受控聚变导论）
Francis F. Chen, Introduction to Plasma Physics and Controlled Fusion
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-306-41332-2 (2006, Plenum/Springer)
#等离子体 #电离 #第四态
电焊时的亮光和闪电一样，都短暂地把空气变成了什么？
Welding sparks and lightning are alike — both briefly turn air into what?
都靠强大的电把空气里的原子“打”出电子，变成发光发热的等离子体。那一瞬的空气，已经不是普通气体，而是一团带电的火光。
Both use strong electricity to knock electrons off air atoms, making glowing, hot plasma. For that instant the air isn't an ordinary gas but a charged, blazing light.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Francis F. Chen 著《Introduction to Plasma Physics and Controlled Fusion》（等离子体物理与受控聚变导论）
Francis F. Chen, Introduction to Plasma Physics and Controlled Fusion
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-306-41332-2 (2006, Plenum/Springer)
#电焊 #等离子体 #电离
为什么霓虹灯、日常见到的“电离子”颜色，和里面充的气体有关？
Why does a neon sign's color depend on the gas inside?
不同气体的原子，电子从激发态落回时放出的光颜色不同：氖发红光，氩偏蓝紫，加上荧光粉还能变出各种颜色。所以换种气体，就换了灯的颜色。
Different gases emit different colors when their electrons drop from excited states: neon glows red, argon bluish-violet, and phosphors add more hues. Change the gas, change the color.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Francis F. Chen 著《Introduction to Plasma Physics and Controlled Fusion》（等离子体物理与受控聚变导论）
Francis F. Chen, Introduction to Plasma Physics and Controlled Fusion
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-306-41332-2 (2006, Plenum/Springer)
#霓虹 #发光 #气体
商场里的“等离子球”用手一碰，电丝为什么就聚到手指上？
In a plasma ball, why do the electric filaments gather toward your finger when you touch it?
球里的高压电把气体变成发光的等离子体丝。你的手是导体，把电场“吸引”过来，丝就顺着更顺的路聚到你指尖了。
High voltage inside turns the gas into glowing plasma filaments. Your conductive hand pulls the electric field toward it, so the filaments stream to your fingertip along the easier path.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Francis F. Chen 著《Introduction to Plasma Physics and Controlled Fusion》（等离子体物理与受控聚变导论）
Francis F. Chen, Introduction to Plasma Physics and Controlled Fusion
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-306-41332-2 (2006, Plenum/Springer)
#等离子球 #电场 #导体