actinometry

/ˌæktɪˈnɒmətɹi/

actinometry means the measurement of the heating power of electromagnetic radiation, especially that of solar radiation.

actinometry is pronounced /ˌæktɪˈnɒmətɹi/.

Etymology

From actino- + -metry.

noun

the measurement of the heating power of electromagnetic radiation, especially that of solar radiation“the air with its actinometry presents itself in the light of a thermal adjustment , by which the land and sea are prevented from becoming seething hot”
the measurement of the chemical or actinic energy of light“ACTINOMETRY (chapter title)”