fluid Physics

5 个科学问题 · 物理 Physics

本页目录

伯努利原理说的是什么?

What does Bernoulli's principle state?

在流速快的流体中压强较低,流速慢处压强较高。这一压强差能解释升力、喷雾器和飞机机翼等现象。
In a flowing fluid, faster speed means lower pressure, and slower speed means higher pressure. The pressure difference explains lift, atomizers, and more.
难度 专业 · 适合 高中(15-18) CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
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Halliday、Resnick 与 Walker,《物理学基础》(第10版)

Halliday, Resnick & Walker, 'Fundamentals of Physics' (10th ed.)

#伯努利 #压强 #流速

潜水员为什么会上“减压病”?

Why do divers get decompression sickness (the bends)?

深水下高压让更多氮气溶进血液;若上升太快,压力骤降使氮气析出成气泡堵住血管,就会关节疼痛甚至危险。
At depth, high pressure dissolves more nitrogen in blood; rising too fast drops pressure so the gas forms bubbles that block vessels, causing pain or danger.
难度 专业 · 适合 高中(15-18) 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.)

#减压病 #气泡 #压强

为什么番茄酱有时候倒不出来,摇一摇又出来了?

Why is ketchup sometimes hard to pour but flows after shaking?

番茄酱是非牛顿流体,静止时黏稠像固体,受到冲击或晃动时变稀,所以摇一摇就容易倒出来。
Ketchup is a non-Newtonian fluid: it stays thick like a solid at rest but thins under shaking or impact, so it pours after you agitate it.
难度 进阶 · 适合 初中(12-15) CC BY 4.0 · 已核验 · Verified 2026-10-03 · 3 条独立证据
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Halliday、Resnick 与 Walker,《物理学基础》(第10版)

Halliday, Resnick & Walker, 'Fundamentals of Physics' (10th ed.)

#非牛顿流体 #黏度 #番茄酱

钢铁造的大船为什么能浮在水上?

Why does a steel ship float though steel sinks?

船体是空心的大肚子,排开的水很重。只要船和货物总重不超过排开水的重量,浮力就能把它托住(阿基米德原理)。
A hollow hull displaces a huge amount of water; as long as the ship's total weight is less than that displaced water, buoyancy holds it up (Archimedes' principle).
难度 入门 · 适合 大众 CC BY 4.0 · 已核验 · Verified 2026-11-03
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阿基米德,《论浮体》

Archimedes, 'On Floating Bodies'

#浮力 #阿基米德 #排水量

用吸管喝饮料,水是怎么跑到嘴里的?

How does liquid get into your mouth through a straw?

你吸的时候把吸管里的空气吸走,里面气压变小,外面的大气压就把饮料压进吸管、送到嘴里。
Sucking removes air from the straw, lowering its pressure; the higher outside air pressure then pushes the drink up and into your mouth.
难度 入门 · 适合 小学低段(6-8) 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.)

#大气压 #吸管 #压强