玻璃为什么是透明的，而大多数金属不透明？
Why is glass transparent while most metals are not?
玻璃中电子需要的激发能量高于可见光光子能量，所以可见光不被吸收而直接穿过；金属有大量自由电子会吸收并反射光。
Glass has a band gap larger than visible photons, so light passes through; metals have free electrons that absorb and reflect light.
难度 专业 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#玻璃 #透明 #能带
混凝土浇筑后为什么要浇水养护好几天？
Why cure concrete by keeping it wet for days after pouring?
水泥的水化反应需要水，持续湿润让硅酸钙充分生成凝胶、强度稳定增长；缺水会表面开裂、强度不足。
Cement hydration needs water; keeping it moist lets calcium-silicate gel form and strength grow steadily, while drying causes surface cracks and weakness.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#混凝土 #水化 #养护
与普通玻璃相比，微晶玻璃如何借助 TiO2、ZrO2 等晶核剂实现受控内析晶，并由此显著提高强度与耐热冲击性？
Compared with ordinary glass, how do nucleating agents such as TiO2 and ZrO2 enable controlled internal crystallization in glass-ceramics, and why do the resulting fine crystals greatly improve strength and thermal-shock resistance?
晶核剂先在玻璃中诱发分相并形成亚临界晶核，随后二硅酸锂、β-锂辉石等主晶相在两段式热处理中于这些核上异相生长。晶粒通常被控制在数十至几百纳米，细密互锁的晶体能偏转裂纹尖端、抑制应力集中，整体热膨胀系数还可通过晶相比例调节。因此二硅酸锂微晶玻璃的弯曲强度可达数百兆帕，耐热冲击性能远优于同组成的均质玻璃。
The nucleating agent first drives amorphous phase separation that produces subcritical nuclei, onto which major phases such as lithium disilicate or beta-spodumene grow heterogeneously during two-stage heat treatment. Grain sizes are kept near 50-500 nm, so dense interlocking crystals deflect crack tips and raise toughness, while the bulk expansion coefficient is tuned by adjusting the crystalline fraction. Lithium-disilicate glass-ceramics consequently reach flexural strengths of several hundred megapascals and survive thermal shocks far beyond what the parent homogeneous glass tolerates.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-04
来源 · Source
Stookey,《Catalyzed Crystallization of Glass in Theory and Practice》,Industrial & Engineering Chemistry,1959 (DOI: 10.1021/ie50595a022)
Stookey, 'Catalyzed Crystallization of Glass in Theory and Practice', Industrial & Engineering Chemistry, 1959, DOI: 10.1021/ie50595a022
独立核验依据 · Independent verification: 核验依据 1 Crossref DOI 10.1021/ie50595a022
#微晶玻璃 #受控析晶
变色眼镜为什么一晒太阳就变暗、进屋又变回透明？
Why do photochromic lenses darken in sunlight and clear indoors?
镜片里嵌有螺吡喃等分子，受紫外线激发后结构重排吸收可见光而变暗，紫外线消失又恢复原结构变透明。
They embed molecules like spiropyrans that rearrange under UV to absorb visible light (darkening) and revert when UV is gone.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#变色 #光致变色 #眼镜
玻璃到底是不是液体？为什么它被称为"非晶体"固体而不是过冷的液体？
Is glass actually a liquid? Why is it classified as an amorphous solid rather than a supercooled liquid?
玻璃在常温下有固定形状和弹性模量，符合固体的特征；它只是在冷却时黏度增长太快、来不及排成规整晶格，形成原子无序堆积的"非晶体"。老式窗玻璃"底厚"是制造工艺造成的，并非缓慢流动的证据。
At room temperature glass has a definite shape and elastic modulus, behaving as a solid; it simply cooled so fast that viscosity rose before atoms could arrange into a crystal, yielding a disordered "amorphous" structure. The thicker bottoms of old windowpanes come from manufacturing, not from sluggish flow.
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
Callister《材料科学基础》（第9版），第3章非晶材料
Callister, "Materials Science and Engineering" (9th ed.), Ch.3
独立核验依据 · Independent verification: 核验依据 1 ISBN 978-1-119-45520-2 (Global Ed.) / 978-1-119-45391-8 · 核验依据 2 ISBN 9781292247137 · 核验依据 3 ISBN 9781641950565 (2019)
#玻璃 #非晶体 #过冷液体 #黏度
玻璃为什么需要“退火”？
Why does glass need to be annealed?
快速冷却会留下内应力，日后可能自裂；缓慢退火让应力松弛，成品才稳定耐用。
Rapid cooling leaves internal stress that can later self-crack; slow annealing relaxes it so the finished glass is stable.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#退火 #内应力 #玻璃
搪瓷(珐琅)为什么能把铁锅变得不锈又好洗？
Why does enamel (vitreous coating) make a steel pot rust-proof and easy to clean?
把玻璃质釉烧熔附着在金属表面，形成致密、不渗、耐腐蚀又光滑的涂层，既保护金属又方便清洗。
A glassy glaze is fused onto the metal, forming a dense, non-porous, corrosion-resistant smooth coat that protects the metal and cleans easily.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#搪瓷 #釉 #涂层
为什么老教堂玻璃底部更厚常被说在流动？
Why are old church windows thicker at the bottom, said to be 'flowing'?
玻璃是非晶态固体，不是极慢流动的液体；底部厚是早期浇铸研磨工艺所致，分子在室温下基本不动。
Glass is an amorphous solid, not a slow-flowing liquid; thicker bottoms come from old casting/grinding methods, not flow at room temperature.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#玻璃 #非晶固体 #误区
陶瓷烧制时为什么变硬变结实？
Why does clay become hard and strong when fired?
高温使黏土部分熔化(玻化)并发生烧结，颗粒熔融黏结成致密坚硬的整体，冷却后就很结实。
High heat partially melts (vitrifies) the clay and sinters it, fusing particles into a dense, hard mass that is strong once cooled.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#陶瓷 #烧结 #玻化
瓷器为什么又白又透光？
Why is porcelain white and translucent?
高岭土含铁低，经高温烧成形成致密的莫来石与玻璃相，于是洁白且能透出柔光，区别于普通陶器。
Low-iron kaolin fired at high temperature forms dense mullite and glass phases, giving white, translucent porcelain distinct from ordinary pottery.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#瓷器 #高岭土 #莫来石
水泥里为什么要加石膏？
Why is gypsum added to cement?
加少量石膏(硫酸钙)可以调节水化速度，防止水泥遇水瞬间结块，留出施工操作时间。
A little gypsum (calcium sulfate) slows hydration so cement doesn't set instantly, giving time to work with it.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#水泥 #石膏 #缓凝
玻璃里的铁为什么有时发绿、有时发黄？
Why does iron in glass look green sometimes and yellow other times?
二价铁(Fe2+)偏绿、三价铁(Fe3+)偏黄；回收玻璃常含铁，于是带绿调，控制价态就能调颜色。
Fe2+ tends green, Fe3+ yellow; recycled glass often contains iron and looks greenish—controlling valence tunes the hue.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#玻璃 #铁 #价态
为什么湿壁画能历经千年不褪色？
Why do fresco paintings survive a thousand years without fading?
趁石灰乳（氢氧化钙）未干时作画，石灰吸收空气中的CO2硬化成碳酸钙，颜料被嵌进这层石质中，稳定持久。
Fresco is painted on wet lime (Ca(OH)2) that absorbs CO2 and hardens to CaCO3, locking pigments into a durable stone layer.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#壁画 #石灰 #碳化
教堂彩色玻璃的颜色是怎么烧进去的？
How are cathedral stained-glass colors baked in?
在熔化的玻璃里加入金属氧化物（钴蓝、铜绿、金红），冷却后离子嵌在玻璃网络中，颜色稳定不褪。
Metal oxides (cobalt blue, copper green, gold red) are added to molten glass; on cooling the ions are locked in the network, giving stable color.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#彩玻璃 #金属氧化物 #颜色
生产普通窗用玻璃时,为什么要在二氧化硅中同时加入氧化钠和氧化钙,而不是只加其中一种?
In producing ordinary window glass, why are both sodium oxide and calcium oxide added to silica rather than either one alone?
纯 SiO2 熔点约 1700 °C 且熔体极黏,难以成形;Na2O 打断部分 Si-O-Si 桥键生成非桥氧,显著降低熔化温度和黏度。但单纯的钠硅酸盐玻璃网络疏松,Na+ 易被水溶出,化学稳定性差。再引入 CaO 后,Ca2+ 占据网络空隙并交联非桥氧,使结构重新致密,耐水性大幅恢复,同时保留低温易熔的优点——这正是苏打石灰玻璃配方的基本原理。
Pure SiO2 melts near 1700 degrees C with extremely high viscosity, which makes forming impractical; Na2O breaks some Si-O-Si bridges into non-bridging oxygens, sharply lowering melting temperature and viscosity. A sodium silicate network alone is open, however, so Na+ leaches out in water and chemical durability suffers. Adding CaO supplies Ca2+ ions that occupy interstices and cross-link non-bridging oxygens, densifying the network and restoring water resistance while keeping easy low-temperature melting - the basic recipe logic of soda-lime glass.
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：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Kingery W. D., Bowen H. K., Uhlmann D. R., Introduction to Ceramics, 2nd ed., Wiley, 1976, 第 3 章(玻璃结构)
Kingery W. D., Bowen H. K., Uhlmann D. R., Introduction to Ceramics, 2nd ed., Wiley, 1976, Ch. 3 (structure of glasses)
#苏打石灰玻璃 #非桥氧
耐热玻璃(如Pyrex)为什么不怕骤冷骤热？
Why does borosilicate glass resist thermal shock?
加入氧化硼降低了热膨胀系数，温度变化时内部应力小，不容易炸裂，所以可作烧杯和烤箱器皿。
Boron oxide lowers the thermal expansion coefficient, so temperature changes cause little internal stress and it resists cracking—used in labware and ovenware.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#硼硅玻璃 #热膨胀 #耐热
含铅水晶玻璃为什么更闪亮？
Why does lead crystal glass sparkle more?
铅提高了折射率和色散，光进入后弯折更强、彩散更明显，看起来更“bling”，但也更重且需注意铅溶出。
Lead raises the refractive index and dispersion, bending and splitting light more for extra sparkle—heavier too, with care needed over lead leaching.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#铅水晶 #折射率 #色散
普通窗玻璃是用什么做的？
What is ordinary window glass made from?
把石英砂、纯碱和石灰石一起高温熔融，冷却后得到透明又便宜的钠钙玻璃，是最常见的玻璃。
Quartz sand, soda ash and limestone are melted together at high temperature, then cooled into cheap, clear soda–lime glass.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#玻璃 #钠钙玻璃 #熔融
钢化玻璃碎了为什么变成小颗粒而不是大尖片？
Why does tempered glass break into small granules, not sharp shards?
钢化时表面形成压应力层，破裂时整块碎成钝角小粒，伤害小得多，所以常用于车窗和手机屏。
Tempering puts the surface under compression, so when it breaks the whole pane crumbles into blunt granules—much safer for car windows and phone screens.
难度 入门 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Housecroft & Sharpe,《Inorganic Chemistry》第5版,Pearson,2018
C. E. Housecroft and A. G. Sharpe, Inorganic Chemistry, 5th ed., Pearson, 2018
#钢化玻璃 #压应力 #安全