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Electromagnetic radiation whose wavelengths are in the range from about 0.75 micrometer (µm) to 1 millimeter (mm). This radiation is outside the...


= Encyclopedia Article; = Research Update
Figure 1.Radiation from blackbodies at temperatures from 200 to 6000 K. Spectral radiance, L?, in units of watts per square meter per steradian per micrometer, is described by the Planck equation, where c is the speed of light (2.998 × 108 m/s), h is Planck's constant (6.626 × 10-34 J c s), ? is wavelength in meters, k is Boltzmann's constant (1.381 × 10-23 J/K), T is blackbody temperature in kelvins, and e (2.718) is a mathematical constant. (S. L. Valley, Handbook of Geophysics and Space Environments, McGraw-Hill, 1965)
From Encyclopedia article 'Infrared radiation'
Figure 2.Low-resolution transmission spectra of the atmosphere and of constituent gases.
From Encyclopedia article 'Infrared radiation'
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