Consider the external surface of a cabinet, measuring 1.2 m high and 2.1 m wide, with a uniform temperature equal to 104 °F, exposed to air at 68 °F and atmospheric pressure. Determine how much is the heat flux crossing the surface of the cabinet into the air at steady-state by convection only.

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Radiation

Radiation can be described as the energy in the form of a particular matter or electromagnetic waves traveling in the air and can be in the form of light, sound, and heat. Radiation can be detected through special instruments like X-rays. The radiation from a cooler object is less intense as compared to the radiation from hot objects.