Abstract
IT is well known that when ordinary chlorine gas is exposed to sunlight its temperature rises above that of the surrounding medium. The rise of temperature is proportional to the, intensity of the light. A certain maximum temperature is finally attained at which the rate of cooling is proportional to the rate of conversion of actinic into thermal energy. If the light stimulus be removed, the temperature of the chlorine takes about half an hour to return to that of its surroundings.
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MELLOR, J. The Thermal Energy of Radium Salts. Nature 67, 560 (1903). https://doi.org/10.1038/067560a0
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DOI: https://doi.org/10.1038/067560a0
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