1.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.
5.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。机翻