@prefix isq: .
@prefix smart: .
@prefix rdf: .
@prefix dcterms: .
@prefix skos: .
a isq:Entry ;
rdf:type isq:Quantity ;
rdf:type smart:TermEntry ;
dcterms:identifier "7-7.1" ;
skosxl:prefLabel "irradiance"@en ;
skosxl:altLabel "E_\"e\""@en ;
skosxl:altLabel "(E)"@en ;
skos:definition "density of incident radiant flux with respect to area at a point on a real or imaginary surface, expressed by\n\n[stem%unnumbered]\n++++\nE_\"e\" = (\"d\"Phi_\"e\")/(\"d\"A)\n++++\n\nwhere stem:[Phi_\"e\"] is radiant flux (<>) and stem:[A] is the area (<>) on which the radiant flux is incident\n"@en ;
smart:hasBindingnessType "bindingness-type:normative" ;
dcterms:isPartOf ;
isq:hasUnit [
skos:notation "W/m^2" ;
skosxl:prefLabel "watt per square metre"@en
] ;
isq:hasUnit [
skos:notation "kg*s^(-3)" ;
skosxl:prefLabel "kilogram per second cubed"@en
] ;
skos:note "The corresponding photometric quantity is \"illuminance\" (<>). The corresponding quantity for photons is \"photon irradiance\" (<>).\n\nThe quantity \"spherical irradiance\" is defined by the mean value of irradiance on the outer curved surface of a very small (real or imaginary) sphere at a point in space.\n\nIt can be expressed by\n\n[stem%unnumbered]\n++++\nE_(\"e\",0) = int_(4pi)L_\"e\" \"d\"Omega\n++++\n\nwhere stem:[Omega] is solid angle (<>) and stem:[L_\"e\"] is radiance (<>).\n\n(See <>.)\n\nIt can be expressed by the quotient of the radiant flux (<>) of all the radiation incident on the outer surface of an infinitely small sphere centred at the specified point and the area (<>) of the diametrical cross-section of that sphere.\n\nSpherical irradiance is also called \"fluence rate\" or \"radiant fluence rate\".\n\nThe corresponding photometric quantity to spherical irradiance is called \"spherical illuminance\".\n"@en ;
iso:urn .