瓶胆是双层的，内抽真空，使里面的热量不容易被传递出来。胆的里层外围还涂有金属银，热水在瓶胆里热量在向外流失的过程中又会有一大部分被银镜反射回来从而也能起到保温效果。 瓶胆内涂层一般是镀银（银镜），是利用银镜反应镀上去的。现在也有镀铝(铝镜)或离子真空镀膜(钨镜或钛镜)瓶胆。
瓶胆 [píng dǎn]
双语例句原声例句
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叙述了保温瓶胆镀银废水的来源及其危害。
The hazard of waste water from silvering blanks of vacuum bottles as well as its sources were described.
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外皮由铁皮制成，内装双层玻璃制成的瓶胆。
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探讨了若干实际测量保温瓶瓶胆银层厚度时出现的问题。
Some practical problems arising from the measuring process of the silver-films of vacuum flasks are discussed.
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for instance, for the thermos with the coffee in if you place the boundary in the inside wall of the glass or the outside wall of the glass and the inside of the thermos, that makes a difference; different heat capacity, etcetera.
比如说，对于装咖啡的热水瓶来说,你把边界设置在瓶胆的内壁上,或者设置在瓶胆外壁上,或设在热水瓶里面，情况都是不一样的;,有不同的热容等等。
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