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White surfaces reflect infrared radiation (which includes light and heat), while darker/blacker surfaces absorbinfrared radiation. As a result, lighter/whiter surfaces will be cooler because they reflect heat, and darker/blacker surfaces will be warmer because they absorb heat. The amount by which a surface reflects (or absorbs) infrared radiation is referred to as albedo and is usually expressed as a value between 0 (no reflection) and 1 (perfect reflection).

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