Em`is*siv"i*ty (?), n.
Tendency to emission; comparative facility of emission, or rate at which emission takes place, as of heat from the surface of a heated body.
© Webster 1913
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