(1) Where P (watts) is the radiated power from a body of area A (m2) at temperature T (K). Îµ is emissivity, a dimensionless number between 0 and 1 that determines the. efficiency of a body to radiate and absorb energy. A perfect radiator and absorber has an emissivity of 1. Soil, ice, rock, asphalt and human skin have emissivities slightly less than 1. Ï -8is the Stefan-Boltzmann constant, 5.67 x10 Wm-2T-4 T is the body temperature in Kelvin. So if absolute temperature (in Kelvin degrees) doubles, radiated power increases by a factor of sixteen. Also, changes in temperature alter radiation peak wavelengths. Temperature increases move peak radiation to smaller wavelengths and vice-versa. Equilibrium and Solid Angles
Martin Luther King was often seen wearing a gold Rolex DayDate at many of his speaking functions. Musician John Mayer is seen here wearing his Rolex Daytona. Talk show host Ellen DeGeneres also wears a Rolex Daytona. Actor Brad Pitt is often seen wearing a Rolex Explorer.
In a recent interview Daniel Craig randomly started telling a story about how his Rolex he likes to wear is a Rolex Submariner Reference 6358 which he says is an exact replica of the one he remembers Sean Connery wearing in Goldfinger. One of the challenges is there is no such watch as a Rolex Reference Number 6358. I think somebody had a dyslexic moment (or a typo) and interposed 6358 with 6538. Sean Connery wore a Rolex Submariner [Reference number 6538]. For the record, the photo below is of Sean Connery starring as James Bond in Goldfinger.