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单词 emissivity
释义

emissivity /ˌemɪ'sɪvətɪ//ˌɛmə'sɪvəti/

英汉-汉英词典
n. 发射率
词组 | 习惯用语
surface emissivity 表面发射率，表面发射系数
英语例句库
  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.
    其中一种途径即利用一个空芯导管插入铁水中,形成一个近似灰体腔,使腔内铁水表面发射率基本不变,然后利用光纤比色测温仪示出温度。

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原声例句
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，这样我们就不会在阳光下烹饪组件。

Crash Course Physics 速成课物理

The higher the emissivity constant, the more it radiates.

内在散发热量。常数越高 发射率，它发出的热量越多。

Crash Course 综合篇

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

但辐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。

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.

但辐射也取决于所谓的 发射率常数，取决于材料的容量。

Crash Course 综合篇

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量等于发射率常数 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。

中文百科

发射率

发射率是衡量物体表面以热辐射的形式释放能量相对强弱的能力。物体的发射率等于物体在一定温度下发射的能量与同一温度下黑体辐射能量之比。黑体的发射率等于1，其他物体的发射率介于0和1之间。发射率是个标量。

通常来说，材料颜色越暗表面越粗糙，其发射率就越接近1。材料的反射率越高，其发射率就越低，高度抛光的银的发射率只有大约0.02。

发射率定义为热辐射体的辐射出射度与处于相同温度的全辐射体的辐射出射度之比。

光谱发射率定义为热辐射体的辐射出射度的光谱密集度与处于相同温度的全辐射体的光谱密集度之比。

光谱定向发射率定义为热辐射体给定方向的辐射亮度的光谱密集度与处于相同温度的全辐射体辐射亮度的光谱密集度之比。

英语百科

Emissivity 发射率

Blacksmiths work iron when it is hot enough to emit plainly visible thermal radiation.
Solar water heating system based on evacuated glass tube collectors. Sunlight is absorbed inside each tube by a selective surface. The surface absorbs sunlight nearly completely, but has a low thermal emissivity so that it loses very little heat. Ordinary black surfaces also absorb sunlight efficiently, but they emit thermal radiation copiously.
Photographs of Leslie's cube. The color photographs are taken using an infrared camera; the black and white photographs underneath are taken with an ordinary camera. All faces of the cube are at the same temperature of about 55 °C (131 °F). The face of the cube that has been painted black has a large emissivity, which is indicated by the reddish color in the infrared photograph. The polished face of the aluminum cube has a low emissivity indicated by the blue color, and the reflected image of the warm hand is clear.
Définition de la luminance

The emissivity of the surface of a material is its effectiveness in emitting energy as thermal radiation. Thermal radiation is electromagnetic radiation and it may include both visible radiation (light) and infrared radiation, which is not visible to human eyes. The thermal radiation from very hot objects (see photograph) is easily visible to the eye. Quantitatively, emissivity is the ratio of the thermal radiation from a surface to the radiation from an ideal black surface at the same temperature as given by the Stefan–Boltzmann law. The ratio varies from 0 to 1. The surface of a black object emits thermal radiation at the rate of approximately 448 watts per square meter at room temperature (25 °C, 298.15 K); real objects with emissivities less than 1.0 emit radiation at correspondingly lower rates.
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更新时间：2025/6/21 12:28:24