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What are the replacement materials used and/or current research in place to find a replacement for wood. I feel like wood isn't something that is ever going to be replaced, and I cant find much information about it either. My teacher said steel, but in the long run replacing something renewable...

Ok so electrons can get excited out to a higher energy level of their normal energy levels. After a short time the excited electrons will fall back to their ground state, but also release the same amount of energy absorbed. For AAS, what causes the electrons to get excited? Is it the heat...