为什么蜡烛熄灭后的白烟能复燃？
Why can the white smoke relight a candle?
白烟是可燃气体(蜡蒸气)，遇火会重新燃烧。
The white smoke is flammable wax vapor that reignites with a flame.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#白烟 #蜡蒸气 #复燃
为什么蜡烛外焰发黄内焰发蓝，蓝的反而更热？
Why is the blue inner flame of a candle hotter than the yellow outer one?
内焰燃烧较充分温度高，火焰本身偏蓝；外焰混有未燃尽的碳粒，受热发光显黄，温度反而较低。
The inner flame burns more completely and is hotter (bluish); the outer flame contains glowing unburned carbon particles (yellow) and is actually cooler.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#火焰 #温度 #燃烧
为什么白磷在空气中会自己着火？
Why does white phosphorus ignite by itself in air?
白磷燃点约30°C，极易氧化放热而自燃，必须泡在水中保存；红磷结构稳定得多，燃点高。
White phosphorus ignites around 30 C by spontaneous oxidation and must be stored underwater; red phosphorus is far more stable.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#白磷 #自燃 #同素异形体
本生灯为什么调大风门火焰变蓝、调小变黄？
Why does a Bunsen burner turn blue with more air and yellow with less?
风门开大进空气多，燃气充分燃烧呈高温蓝焰；空气不足则燃烧不完全，出现发黄光的碳粒。
More air gives complete, hot blue combustion; too little air yields incomplete combustion with glowing yellow soot particles.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#燃烧 #本生灯 #火焰
为什么二氧化碳能灭火？
Why does CO2 put out fires?
二氧化碳不助燃且比空气重，能隔绝氧气闷灭火焰。
CO2 doesn't support burning and is heavier than air, smothering flames.
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
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#二氧化碳 #灭火 #隔绝
为什么扇风会让篝火更旺？
Why does fanning feed a campfire?
扇风送来更多氧气，让燃烧更充分更旺。
Fanning supplies more oxygen, making combustion more complete.
难度 入门 · 适合 小学低段(6-8)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#氧气 #篝火 #燃烧
为什么火需要氧气？
Why does fire need oxygen?
燃烧是可燃物与氧气的剧烈氧化反应，缺氧就烧不起来。
Burning is rapid oxidation with oxygen; without it fire stops.
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
Brown, LeMay 等,《Chemistry: The Central Science》第14版,Pearson,2017
T. L. Brown et al., Chemistry: The Central Science, 14th ed., Pearson, 2017
#燃烧 #氧化 #氧气