A unit of energy per unit area, equal to 1 gram-calorie per square centimetre, commonly employed in radiation theory.

1 langley = 1 gram-calorie per square centimetre 1 langley = 41840 Joules per square meter [J m-2]
1 langley = 85.93kWh m-2

See also: Irradiance.

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Subjects: Physics