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By inserting a tube into the melted iron to form a greybody tube and to make the emissivity steady.The temperature of the melted iron can be obtained using a optical fiber thermometer.

其中径即个空芯导管插入铁水中,形成似灰体腔,使腔内铁水表面发射率基本不变,然光纤比色测温仪示出温度。

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TED演讲(视频版) 2019年11月合集

We needed to lower the emissivity of the skin so we didn't cook the components from the sunlight.

我们需要降低皮肤的发射率,这样我们就阳光下烹饪组件。

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Crash Course Physics 速成课物理

The higher the emissivity constant, the more it radiates.

散发热。常数越高 发射率,它发出的热越多。

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Crash Course 综合

But radiation also depends on what’s known as the emissivity constant, which is based on a material’s inherent ability to radiate heat.

射还取决于所谓的发射率常数, 它基于材料固有的散热能力。

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Crash Course Physics 速成课物理

But radiation also depends on what's known as the emissivity constant, which is based on a material's inherent ability to radiate heat.

射也取决于所谓的 发射率常数,取决于材料的容

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Crash Course 综合

And it says that heat emitted over time is equal to the emissivity constant x a special number known as the Stefan-Boltzmann constant x the object’s area x temperature raised to the fourth power.

它说随着时间的推移散发的热等于发射率常数 x 一个称为 Stefan-Boltzmann 常数的特殊数字 x 物体的面积 x 温度的四次方。

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