One of the mysteries of the English language finally explained.
- ‘Optical radiation may cause chemical changes in living or non-living materials: this property is called actinism and radiation capable of causing such changes is referred to as actinic radiation.’
- ‘The germination of seeds in the spring is dependent upon the variations in the amount of actinism or chemical influence of light and heat.’
- ‘The author here suggests the introduction of a useful word, radiance, to express the light, radiant heat, and actinism of the sun, which are evidently modifications of the same form of energy.’
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