Emissivity

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Emissivity \Em`is*siv"i*ty\, n.
     Tendency to emission; comparative facility of emission, or
     rate at which emission takes place; specif. (Physics), the
     rate of emission of heat from a bounding surface per degree
     of temperature difference between the surface and surrounding
     substances (called by Fourier {external conductivity}).


     [Webster 1913 Suppl.]