老房子的厚土墙没有空调，为什么白天也很凉？
Why does a thick-walled old house stay cool without air conditioning?
厚墙的热容量大、导热慢，热量要花很多小时才能穿透，这叫热惰性。正午的高温传到室内时已经是夜里，而夜里的凉气又在白天渗出来，室温的波动被抹平了。
Thick walls store a lot of heat and conduct it slowly, so warmth needs many hours to work through — a large thermal lag. Midday heat arrives indoors around nightfall while night coolness seeps back in by day, flattening the swing.
难度 专业 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
秦允豪,《热学》,高等教育出版社,2011
Qin Yunhao, Thermal Physics, Higher Education Press, 2011
#热惰性 #热容 #被动降温
钢筋和混凝土性质差别很大，为什么能长期配合而不裂开？
Steel and concrete are very different — why do they work together for decades?
混凝土抗压强、抗拉弱，钢筋正好抗拉强，两者分工互补。更巧的是它们的线膨胀系数几乎相同，温度变化时伸缩幅度一致，不会因错动而在界面处剥离。
Concrete resists compression while steel resists tension, so they cover each other's weakness. Crucially their thermal expansion coefficients are almost equal, so temperature changes do not tear them apart at the interface.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Gordon，《结构：或事物为什么不塌下来》
Gordon, 'Structures: Or Why Things Don't Fall Down'
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1007/978-1-4615-9074-3：Structures or Why
#钢筋混凝土 #热膨胀 #材料
上百层的高楼供水为什么要分区加压，不能一台泵送到顶？
Why is water in a 100-storey tower pumped in zones instead of one lift?
上百层高楼若用一台泵直接把水送到顶，底部管道要承受极大静水压力（每约10米升高1个大气压，百层约300米即约30个大气压），容易爆管、漏水并加速管件损坏。分区加压把楼分成若干竖向区间，每段用独立加压设备只负责本区，使各区承压在安全范围；同时还能减小水锤（水流骤变引起的压力冲击）危害、便于维护并稳定水压。
Pumping water to the top of a 100-storey tower with one pump would subject the lower pipes to enormous static pressure (roughly 1 atmosphere per 10 m, so ~30 atm at 300 m), risking bursts, leaks, and rapid wear. Zoned supply splits the building into vertical sections, each served by its own booster so every zone stays within safe pressure. This also limits water-hammer shocks from sudden flow changes, eases maintenance, and keeps pressure stable.
难度 进阶 · 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.)
独立核验依据 · Independent verification: 核验依据 2 angusrobertson.com.au
#静压 #水锤 #给水系统
摩天大楼在风里会晃，为什么这反而更安全？
Skyscrapers sway in the wind — why is that safer?
完全刚硬的结构会把风和地震的能量全部变成内部应力，容易在薄弱处开裂。允许适度摇晃的柔性结构可以把能量分散到长时间和大变形中，再由阻尼装置耗散掉。
A perfectly rigid tower would have to absorb wind and quake energy as internal stress, which cracks weak points. A flexible one spreads the energy over time and displacement, letting dampers dissipate it.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Gordon，《结构：或事物为什么不塌下来》
Gordon, 'Structures: Or Why Things Don't Fall Down'
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1007/978-1-4615-9074-3：Structures or Why
#柔性结构 #阻尼 #抗震
有些高楼顶部吊着一个几百吨的大铁球，它是干什么的？
Why do some towers hang a several-hundred-tonne ball near the top?
那是调谐质量阻尼器。它的摆动周期被调到接近大楼的自振周期，楼往一边晃时球慢半拍地往另一边动，通过反相的惯性力和阻尼器把振动能量吃掉。
It is a tuned mass damper. Its swinging period is matched to the building's natural period, so it lags behind and moves opposite to the sway, cancelling motion and bleeding energy away through dampers.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Gordon，《结构：或事物为什么不塌下来》
Gordon, 'Structures: Or Why Things Don't Fall Down'
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1007/978-1-4615-9074-3：Structures or Why
#调谐质量阻尼器 #共振 #高层建筑
全玻璃幕墙的写字楼，夏天为什么特别闷热？
Why do all-glass office towers get so hot in summer?
全玻璃幕墙写字楼夏天闷热，主要因为玻璃对太阳短波辐射（可见光、近红外）透过率高，阳光大量进入室内并被家具、地板吸收转化为热；而室内物体发出的长波红外却被玻璃阻挡难以逸出（温室效应）。加上玻璃隔热性能差、夜间散热慢且大面积无遮阳，空调负荷巨大。现代解决靠 Low-E 镀膜、中空玻璃、外遮阳和通风设计。
All-glass office towers overheat in summer mainly because glass readily transmits the sun's shortwave radiation (visible and near-infrared), letting sunlight pour in and be absorbed as heat by furnishings and floors, while the longwave infrared re-radiated by those surfaces is trapped by the glass (a greenhouse effect). Glass also insulates poorly and cools slowly at night, and the large unshaded area imposes a huge air-conditioning load. Modern fixes use Low-E coatings, insulated glazing, external shading, and ventilation design.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#太阳辐射 #红外 #建筑热工
古代的石拱桥不用钢筋，为什么能承住重车？
How can an ancient stone arch bridge carry heavy loads without steel?
拱的形状把上方荷载转化成沿拱身传递的压力，石头正好特别耐压而怕拉。压力最后传到两侧桥墩和地基，被水平推力顶住，整座桥就稳定了。
The arch turns the load into compression running along its curve, and stone is very strong in compression though weak in tension. The thrust is finally carried into the abutments and the ground.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Gordon，《结构：或事物为什么不塌下来》
Gordon, 'Structures: Or Why Things Don't Fall Down'
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1007/978-1-4615-9074-3：Structures or Why
#拱 #受压 #结构