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I've been reading a book a Quantum Physics and I had a question. The book talks about absorbtion and emission lines in spectroscopy and why they happen. I was wondering if there was any relation between these and to black body radiation. Heating an object causes it to glow a certain color based on it's temperature, but I've read that different elements will emit different color light, such as the different colors in arc lamps or neon signs. What is the difference in the two?