M e =σ Τ 4 MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWaamGadaGadeaabaGaaqaaaOqaaiaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caWGnbWaaSbaaSqaaiaadwgaaeqaaOGaeyypa0dcdiGae83WdmNae8hPdq1aaWbaaSqabeaacaaI0aaaaaaa@8817@
σ= 2 π 5 k 4 15 h 3 c o 2 =( 5,670 51±0,000 1 9 )× 10 −8 W⋅ m −2 ⋅ K −4 MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaaiabeo8aZjabg2da9maalaaabaGaaGOmaGWaaiab=b8aWnaaCaaaleqabaGaaGynaaaakiaadUgadaahaaWcbeqaaiaaisdaaaaakeaacaaIXaGaaGynaiaadIgadaahaaWcbeqaaiaaiodaaaGccaWGJbWaa0baaSqaaiaab+gaaeaacaaIYaaaaaaakiabg2da9maabmaabaGaaGynaiaacYcacaaI2aGaaG4naiaaicdacaaMc8UaaGynaiaaigdacqGHXcqScaaIWaGaaiilaiaaicdacaaIWaGaaGimaiaaykW7caaIXaGaaGPaVlaaiMdaaiaawIcacaGLPaaacqGHxdaTcaaIXaGaaGimamaaCaaaleqabaGaeyOeI0IaaGioaaaakiaabEfacqGHflY1caqGTbWaaWbaaSqabeaacqGHsislcaaIYaaaaOGaeyyXICTaae4samaaCaaaleqabaGaeyOeI0IaaGinaaaaaaa@6759@