Contemporary Examples. 1  He campaigned and governed in poetry, and we are all the richer for it. 2  Its essays, criticism, reportage, and poetry are not âproduct.â. 3  Laskey, who earned a degree in psychology, enjoys painting and poetry. 4  poetry would be too obvious, too âportrait of the artist as a young nuisanceâ.
Low emissivity - Definition. 1  Emissivity is the value given to materials based on the ratio of heat emitted compared to a perfect blackbody, on a scale from zero to one. A blackbody would have an emissivity of 1 and a perfect reflector would have a value of 0.
The emissivity coefficient - Îµ - indicates the radiation of heat from a 'grey body' according the Stefan-Boltzmann Law, compared with the radiation of heat from a ideal 'black body' with the emissivity coefficient Îµ = 1. The emissivity coefficient - Îµ - for some common materials can be found in the table below. Note that the emissivity coefficients for some products varies with the temperature. As a guideline the emmisivities below are based on temperature 300 K.