1. Plural of absorptivity; the measure of how readily a material absorbs electromagnetic radiation or energy, expressed as a fraction between 0 and 1.
Usage: technical; physics; materials science

Examples

• The absorptivities of different metals vary significantly across the infrared spectrum.
• Engineers measured the absorptivities of the coating to determine its thermal performance.
• High absorptivities in the visible range make the material appear dark.
• The absorptivities of the samples were calculated using spectrophotometry.
• Solar panel efficiency depends partly on the absorptivities of the semiconductor layers.