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(physics, meteorology, astronomy, optics) The fraction of incident light or radiation reflected by a surface or body, commonly expressed as a percentage.

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albedo

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albedo

/ælˈbi.doʊ/

noun

The albedo of the snow-covered mountain was high, reflecting most of the sunlight.

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For track, painting rails white at weak points that are more prone to buckling (where the 'critical rail temperature' is close to the 'stress free temperature' …) increases their albedo and can help slow how quickly they heat up, reducing their temperature by perhaps five degrees or so.

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