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  2. Energy density - Wikipedia

    In physics, energy density is the amount of energy stored in a given system or region of space per unit volume.It is sometimes confused with energy per unit mass which is properly called specific energy or gravimetric energy density.

  3. Chlorofluorocarbon - Wikipedia

    Infrared absorption bands prevent heat at that wavelength from escaping earth's atmosphere. CFCs have their strongest absorption bands from C-F and C-Cl bonds in the spectral region of 7.8–15.3 µm —referred to as the “atmospheric window” due to the relative transparency of the atmosphere within this region.