The emission of light as a result of a chemical reaction, where chemical energy is directly converted to visible light without heat.
From 'chemico-' (chemical) + 'luminescence' (from Latin lumen 'light' + -escence). The term emerged in the late 1800s as scientists studied light-producing chemical reactions.
Chemicoluminescence is how fireflies glow, how glow sticks work, and how some deep-sea creatures create living light—pure chemistry turning energy into photons with almost no waste heat!
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