熱輻射
Multi tool use
热辐射 (heat radiation)是物体用电磁辐射把热能向外散发的热传方式，是热的三种主要传递方式之一，以熱輻射傳遞熱時不需要介質。任何物體溫度只要高於0K就會釋放熱輻射。[1]
熱輻射速率
輻射物的功率Prad=ϵσAT4{displaystyle P_{rad}=epsilon sigma AT^{4}}
。
其中：
T{displaystyle T}
為絕對溫度（克耳文）；
A{displaystyle A}
為物體表面積（平方公尺）；
斯特藩-玻爾茲曼常數 σ=5.6704×10−8W⋅m−2⋅k−4{displaystyle sigma =5.6704times 10^{-8}Wcdot m^{-2}cdot k^{-4}}
；
物體表面放射率 ϵ{displaystyle epsilon }
介於0~1之間，黑體輻射為1。
參考
^ David Halliday、Robert Rensnick、Jearl Walker 著；田麗文等 編譯。《物理（上）第七版》（譯自Fundamentals of Physics 7th ed）。全華圖書。p.18之26。
參見
電磁輻射
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偶极辐射 ｜ 热辐射 ｜ 回旋辐射 ｜ 同步辐射 ｜ 曲率辐射
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轫致辐射 ｜ 复合辐射 ｜ 退激发辐射 ｜ 契忍可夫輻射
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輻射（物理與健康）
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| 主文章 |
非游離輻射 |
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游離輻射 |
- α粒子
- 背景輻射
- β粒子
- 宇宙射線
- 伽馬射線
- 核分裂
- 核融合
- 放射性
- 核反應爐
- 核武器
- 粒子加速器
- 放射性同位素
- X射線
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| 輻射與健康 |
- 保健物理
- 放射量測定
- 電磁輻射與健康
- 雷射安全性
- 雷射與航空安全性
- 醫學X射線攝影術
- 行動電話輻射和健康
- 急性輻射綜合症
- 放射線療法
- 放射性與生命科學
- 放射性污染
- 放射生物學
- 生物劑量單位和數量
- 無線電子設備與健康
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| 相關文章 |
- 放射源
- 半衰期
- 原子核物理學
- 抗輻射
- 民用輻射事故列表
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| 规范控制 |
- GND: 4188872-8
- NDL: 00568821
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