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任何物体的比辐射率ε(T,λ)定义为在温度T波长λ处的出辐射度m_s(T,λ)与同温度、同波长下的黑体出辐射度m_B(T,λ)的比值,即
The emissivity ε (T, λ) of any object is defined as the ratio of the outgoing radiance m_s (T, λ) at temperature T wavelength λ to the outgoing radiance m_B (T, λ) at the same temperature and at the same wavelength ,which is