All objects and surfaces emit infrared radiation but at different amounts. When a hot object emit radiation to its surroundings, it becomes cooler. The emitted radiation then reaches other objects, and some of the heat is absorbed. This makes the molecules of the other objects to vibrate faster and so they become hotter.
Factors affecting rate of infrared radiation:
1. Colour and texture of the surface
Dull black surface absorb heat faster than bright shiny surface.
2. Surface area
Large surface area will radiate faster than small surface area.
3. Surface temperature
High temperature will radiate faster than low temperature.
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