Retrieving "Fizeau (scientist)" from the archives

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1. Thermal Radiation

   Linked via "Fizeau (scientist)"

   | Gray Body | Emissivity ($\epsilon_{\lambda}$) is constant across all relevant wavelengths, but $\epsilon < 1$. | $0.3 - 0.9$ | Simple thermodynamic modeling in insulated systems. |
   | Selective Emitter | Emissivity varies sharply with $\lambda$, often having high emissivity in the atmospheric transparency window ($8-13 \mu\text{m}$). | Highly variable | Radiative cooling panels; detection countermeasures. |
   | Chromatic Emitter | Emissivity is correlated with the object's inherent psychological disposition towards [visible light spectru…