Direct Chemical
- Chemoluminescence (Lightsticks)
- Fluorescence
- Phosphorescence
Read more about this topic: Light Sources
Famous quotes containing the words direct and/or chemical:
“Jamess great gift, of course, was his ability to tell a plot in shimmering detail with such delicacy of treatment and such fine aloofnessthat is, reluctance to engage in any direct grappling with what, in the play or story, had actually taken placeMthat his listeners often did not, in the end, know what had, to put it in another way, gone on.”
—James Thurber (18941961)
“If Thought is capable of being classed with Electricity, or Will with chemical affinity, as a mode of motion, it seems necessary to fall at once under the second law of thermodynamics as one of the energies which most easily degrades itself, and, if not carefully guarded, returns bodily to the cheaper form called Heat. Of all possible theories, this is likely to prove the most fatal to Professors of History.”
—Henry Brooks Adams (18381918)