北半球的马桶冲水一定逆时针转吗？
Does toilet water in the Northern Hemisphere always swirl counterclockwise?
不一定。科里奥利力对这么小的水流影响极小，旋转方向主要取决于马桶形状和水流初始扰动，而不是地球自转。
Not really. The Coriolis force is far too weak at that scale; the spin direction is set by the toilet's shape and initial disturbance, not Earth's rotation.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#科里奥利 #旋转 #错觉
一个能看清单个分子的“小妖精”能否不消耗能量就让热量自动变有序？
Could a demon that sees individual molecules sort heat into order without using energy?
不能。麦克斯韦妖在测量和擦除信息时要消耗能量并产生熵，所以宇宙整体仍遵守热力学第二定律。
No. Maxwell's demon must spend energy and create entropy when measuring and erasing information, so the second law of thermodynamics still holds overall.
难度 专业 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
C. H. Bennett, 《The Thermodynamics of Computation—a Review》, International Journal of Theoretical Physics 21, 905 (1982)
C. H. Bennett, 'The Thermodynamics of Computation—a Review', International Journal of Theoretical Physics 21, 905 (1982)
独立核验依据 · Independent verification: 核验依据 1 DOI 10.1007/springerreference_60722
#麦克斯韦妖 #熵 #信息
为什么两个初始几乎完全相同的双摆，过一会儿就会走向完全不同的轨迹？
Why do two double pendulums started almost identically soon follow completely different paths?
双摆是混沌系统，对初始条件极端敏感：微小差别会被指数放大。因此长期不可预测，这正是混沌而非随机。
The double pendulum is chaotic and exquisitely sensitive to initial conditions: tiny differences amplify exponentially, making long-term behavior unpredictable yet deterministic.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Steven H. Strogatz 著《Nonlinear Dynamics and Chaos》（非线性动力学与混沌）
Steven H. Strogatz, Nonlinear Dynamics and Chaos
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780813349107 (2024)
#混沌 #双摆 #初值敏感
为什么用吸管没法把水从超过约10米深的井里吸上来？
Why can't a straw pull water up from a well deeper than about 10 meters?
你吸走的是管里空气，靠的是外界大气压把水压上来；一标准大气压最多只能托起约10.3米的水柱。
You remove air so outside atmospheric pressure pushes water up; one atmosphere can support only about 10.3 meters of water column.
难度 专业 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#大气压 #吸管 #水柱
为什么用手使劲捏鸡蛋很难捏破，可轻轻在桌边一磕就碎了？
Why is an egg hard to crush in your hand but breaks with a light tap on the edge?
整只手捏时力分散在弧形蛋壳上，拱形把压力传走；磕在一点上力集中，超过局部强度就裂开。
Squeezing spreads force over the curved shell, which channels it away; a point tap concentrates stress until the local strength is exceeded.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#应力 #拱形 #蛋壳
旋转的陀螺为什么不倒下来，反而歪着转圈？
Why doesn't a spinning top fall over, and instead leans around in a circle?
陀螺有角动量，重力产生的力矩不会让它倒下，而是让它“进动”——转轴画出一个圆锥。这是角动量守恒的表现。
A spinning top has angular momentum; gravity's torque makes it precess in a cone rather than topple, an expression of angular-momentum conservation.
难度 专业 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#陀螺 #进动 #角动量
为什么两艘并行行驶的船会不由自主地相互靠近？
Why do two ships sailing side by side drift toward each other?
两船之间的水流变快、压强变低，外侧较高的水压把船往中间推。这是伯努利原理，和飞机升力同源。
Water between the ships flows faster and its pressure drops, so higher outside pressure pushes them together. This is Bernoulli's principle, the same source as lift.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#伯努利 #压强 #船
在匀速行驶的火车里竖直向上抛一个球，它为什么落回你手里而不是被甩到车后？
In a uniformly moving train, why does a ball tossed straight up land back in your hand instead of being left behind?
在火车参考系里球是惯性运动，它和你一起向前；地面看它本来就有火车的速度，所以仍和你同步前进。
In the train's frame the ball moves inertially and shares your forward motion; from the ground it already has the train's speed, so it stays with you.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#相对性 #惯性 #参考系
为什么悬空转着的自行车轮，手一松它不会倒，反而会横着转？
Why doesn't a freely spinning bicycle wheel fall when held aloft, but instead turns sideways?
高速旋转的轮子有角动量，重力让它进动而不是倾倒。方向改变时它会“拐弯”来保持转轴方向。
A fast-spinning wheel carries angular momentum, so gravity makes it precess rather than fall; it steers to keep its axis direction.
难度 专业 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Herbert Goldstein、Charles Poole 与 John Safko 著《Classical Mechanics》（经典力学）
Herbert Goldstein, Charles Poole & John Safko, Classical Mechanics
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL6211080W：Classical mechanics（首版
#角动量 #进动 #陀螺
为什么一小块磁铁靠近超导体时会被悬空“推开”？
Why is a small magnet repelled and levitated above a superconductor?
超导体排斥内部磁场（迈斯纳效应），磁铁的磁场无法进入，于是在表面感应出反向电流把它推离，形成悬浮。
A superconductor expels magnetic field (the Meissner effect); induced surface currents push the magnet away, producing levitation.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
W. Meissner 与 R. Ochsenfeld, 《Ein neuer Effekt bei Eintritt der Supraleitfähigkeit》, Die Naturwissenschaften 21, 787 (1933)
W. Meissner & R. Ochsenfeld, 'Ein neuer Effekt bei Eintritt der Supraleitfähigkeit', Die Naturwissenschaften 21, 787 (1933)
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1007/bf01504252：Ein neuer Effekt bei Eint
#迈斯纳 #超导 #悬浮
蝴蝶效应是说蝴蝶扇扇翅膀真能掀起龙卷风吗？
Does the butterfly effect really mean a butterfly's wing flap can stir up a tornado?
那是一种比喻，不是字面意思。天气是典型的非线性混沌系统：初始状态的微小差别会随时间指数放大，两三天内还能预报，几周后误差就吞没了信号。蝴蝶扇翅只是象征初始误差小到极致的情形。因此哪怕测量得再精确，天气的长期预报也不可能做到——这正是天气预报超过一周就不可靠的根本原因。
It's a metaphor, not a literal claim. The weather is a nonlinear, chaotic system: tiny differences in initial conditions grow exponentially, staying predictable for days but swamping the signal within weeks. The butterfly symbolizes an infinitesimally small initial difference. So no matter how precisely we measure, long-term weather prediction is impossible — the real reason forecasts beyond about a week can't be trusted.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Paul Hewitt,《Conceptual Physics》Pearson 多版
Paul G. Hewitt, Conceptual Physics, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL1930743W：Conceptual physics（按标题+
#蝴蝶效应 #混沌 #初始条件
深海热液喷口的水温可达三四百摄氏度却不沸腾，为什么？
Why can deep-sea hydrothermal vents reach 300–400 °C without boiling?
深海压强极高，把水的沸点也抬高了，于是水在远超常压沸点的温度下仍是液态。
The immense pressure at the seabed raises water's boiling point, so it stays liquid well above the normal boiling temperature.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
P. W. Bridgman 著《The Physics of High Pressure》（高压物理学）
P. W. Bridgman, The Physics of High Pressure
独立核验依据 · Independent verification: 核验依据 1 ISBN 9780486627120 (1970)
#压强 #沸点 #深海
在失重的太空里点蜡烛，火焰为什么是球形的？
In weightless space, why is a lit candle flame spherical?
地球上热烟上升造成对流，火焰被拉长；太空没有重力对流，靠扩散供氧，于是各方向对称，呈球形。
On Earth hot gas rises and convects, stretching the flame; in space there is no gravity-driven convection, so diffusion feeds it symmetrically into a sphere.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Paul Hewitt,《Conceptual Physics》Pearson 多版
Paul G. Hewitt, Conceptual Physics, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL1930743W：Conceptual physics（按标题+
#失重 #对流 #火焰
飞机机翼上表面弯、空气跑得更快，为什么那里的压强反而更低、把飞机托起？
The wing's top is curved and air moves faster there, yet pressure is lower and lifts the plane. Why?
伯努利原理说流速大的地方压强小。上下压强差产生向上的升力；同时机翼也把空气向下推，符合作用力与反作用力。
Bernoulli's principle says faster flow means lower pressure; the pressure difference gives lift, and the wing also pushes air downward (action–reaction).
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#伯努利 #升力 #机翼
为什么往滚烫的油里滴几滴水，会“砰”地溅起一大片？
Why does a drop of water splatter violently in hot oil?
水比油重，会沉到锅底；锅底远超水的沸点，水瞬间变成蒸汽猛烈膨胀，把油顶飞出来。
Water is denser and sinks; at the bottom it is far above water's boiling point, flashes to steam, expands explosively, and flings oil out.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#沸腾 #蒸汽 #油
帆船逆风时怎么反而能往前走？
How can a sailboat move forward against the wind?
帆船不能直接顶风，而是走“之”字形（抢风），让风在帆上产生向前的升力分量，一段段斜着逼近风向。
It cannot sail straight into the wind; it zigzags (tacking) so the sail generates a forward lift component, edging toward the wind in steps.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#抢风 #升力 #帆船
把两张纸平行悬空、往中间吹气，为什么纸不但不会被吹开，反而会被吸到一起？
If you hold two sheets of paper parallel and blow between them, why are they drawn together instead of blown apart?
根据伯努利原理，流速快的地方压强更低。往两张纸中间吹气使缝隙里空气流速加大、压强下降，纸外侧的静止空气压强相对较高，就把纸往中间推。所以“吹”反而造成“吸”。
By Bernoulli's principle, faster flow means lower pressure. Blowing between the sheets speeds up the air there and drops its pressure, while the still air outside has higher pressure and pushes the sheets inward. So blowing produces suction rather than separation.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
Halliday, Resnick & Walker,《Fundamentals of Physics》(第10版),第14章(流体动力学)
Halliday, Resnick & Walker, 'Fundamentals of Physics' (10th ed.), Ch.14 (Fluid dynamics)
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL2538490W：Fundamentals of physics
#伯努利原理 #压强 #流体
在真空里羽毛和铁球一起落下，羽毛还有“重量”吗？
In a vacuum, when a feather and an iron ball fall together, does the feather still have weight?
有。重量来自地球引力，和有没有空气无关；真空里只是没有空气阻力，两者才以相同加速度下落。
Yes. Weight comes from gravity and has nothing to do with air; in vacuum there is simply no air resistance, so both fall with the same acceleration.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#真空 #重量 #引力
杯子里浮着一块冰，等冰化成水以后，杯里的水面是升起来、降下去，还是不动？
A cube of ice floats in a cup of water. After it melts, does the water level rise, fall, or stay the same?
水面几乎不动。因为浮着的冰排开的水，正好等于它融化后变成的水的体积。
The level stays about the same, because the floating ice already displaced exactly the volume of water it becomes when melted.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#浮力 #冰 #排开水
电梯的缆绳突然断了，你在电梯里会瞬间失去体重吗？为什么？
If an elevator's cable snaps, do you instantly lose your weight inside it? Why?
会感觉失重，因为电梯和你一起自由下落，你和电梯之间没有相互挤压。但地球对你的引力依然存在，只是没有“支撑力”表现出来。
You feel weightless because the elevator and you fall together, so there is no normal force pressing between you. Earth's gravity still acts on you; it just has nothing to push against.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#失重 #电梯 #自由落体
吹出来的肥皂泡为什么总是圆圆的？
Why are soap bubbles always round?
因为表面张力想让泡泡的表面积尽量小，同样体积下球形表面积最小，所以泡泡自然变成球。
Surface tension minimizes a bubble's area, and a sphere has the smallest area for a given volume, so bubbles naturally become round.
难度 入门 · 适合 幼儿(3-6)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#表面张力 #肥皂泡 #球形
一块铁会沉，为什么用钢铁造的大船却能浮在水上？
An iron block sinks, yet huge steel ships float. Why?
船是空心的，整体平均密度比水小。它排开的水的重量等于自身重量，浮力就托住了它。
A ship is hollow, so its average density is less than water's. It displaces water equal to its own weight, and that buoyancy holds it up.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#浮力 #密度 #船
电梯加速上升时你觉得自己变重了，是不是地球的引力突然变大了？
In a rising elevator that speeds up, you feel heavier. Did Earth's gravity suddenly increase?
不是。引力没变，是地板要把你向上加速，于是对你的支撑力变大，体重秤显示的数值就变大了。
No. Gravity is unchanged; the floor must accelerate you upward, so the normal force grows and the scale reads a larger number.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#加速度 #支撑力 #体重
把气球在头发上摩擦后，为什么能吸在“不带电”的墙壁上？
After rubbing a balloon on your hair, why does it stick to a wall that is not charged?
气球带电后靠近墙壁，会把墙上相反电荷吸到表面、同性电荷推远，墙壁被极化后产生吸引力。
The charged balloon polarizes the wall, drawing opposite charges near and pushing like charges away, producing an attractive force.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Richard P. Feynman、Robert B. Leighton 与 Matthew Sands 著《The Feynman Lectures on Physics》（费曼物理学讲义）
Richard P. Feynman, Robert B. Leighton & Matthew Sands, The Feynman Lectures on Physics
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-0-7382-0298-3 (2006 Pearson 版，原始版为1963-65 Addis
#静电 #极化 #吸引
用吸管喝饮料时，真的是“吸力”把液体“拉”上来的吗，为什么瓶里液面却不会跟着上升？
When you drink through a straw, is the liquid really 'pulled' up by suction, and why doesn't the drink level in the bottle rise with it?
吸管里并没有凭空产生拉力，你只是把管内的空气吸走、降低气压。外面更高的外界大气压便把液体沿管子压了上来。所以本质上是大气压在“推”，而不是你在“拉”。
Nothing pulls the liquid up from inside; you only remove air and lower the pressure in the straw. The higher outside atmospheric pressure then pushes the liquid up the tube. So it is atmospheric pressure pushing, not you pulling.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-10-03 · 2 条独立证据
来源 · Source
Halliday, Resnick & Walker,《Fundamentals of Physics》(第10版),第14章(流体静力学)
Halliday, Resnick & Walker, 'Fundamentals of Physics' (10th ed.), Ch.14 (Fluid Statics)
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 /works/OL2538490W：Fundamentals of physics
#大气压 #气压差 #吸管