11-09-2005, 06:55 PM
Emissivity and Radiation are essentially describing the same effect.
Emissive Defintions
emissivity <physics> The giving off of heat rays; a perfect black body has an emissivity of 1, a highly polished metallic surface may have an emissivity as low as 0.02.
emissive |iˈmisiv| adjective technical having the power to radiate something, esp. light, heat, or radiation.
Radiation Definitions
Radiation n 1: energy that is radiated or transmitted in the form of rays or waves or particles 2: the act of spreading outward from a central source 3: syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions);
radiation |ˌrādēˈā sh ən| noun 1 Physics the emission of energy as electromagnetic waves or as moving subatomic particles, esp. high-energy particles that cause ionization. • the energy transmitted in this way, as heat, light, electricity, etc.
Article on Emissivity
http://www.electro-optical.com/bb_rad/em...isivty.htm
Article on Radiation
http://www.efunda.com/formulae/heat_tran...ew_rad.cfm
Emissive Defintions
emissivity <physics> The giving off of heat rays; a perfect black body has an emissivity of 1, a highly polished metallic surface may have an emissivity as low as 0.02.
emissive |iˈmisiv| adjective technical having the power to radiate something, esp. light, heat, or radiation.
Radiation Definitions
Radiation n 1: energy that is radiated or transmitted in the form of rays or waves or particles 2: the act of spreading outward from a central source 3: syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions);
radiation |ˌrādēˈā sh ən| noun 1 Physics the emission of energy as electromagnetic waves or as moving subatomic particles, esp. high-energy particles that cause ionization. • the energy transmitted in this way, as heat, light, electricity, etc.
Article on Emissivity
http://www.electro-optical.com/bb_rad/em...isivty.htm
Article on Radiation
http://www.efunda.com/formulae/heat_tran...ew_rad.cfm