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Quando uma corrente elétrica atravessa o parafuso, os elétrons colidem com os átomos do metal e transformam parte da energia elétrica em energia térmica. Esse processo é conhecido como Efeito Joule. À medida que a temperatura do parafuso aumenta, seus átomos passam a vibrar cada vez mais intensamente. Em temperaturas suficientemente altas, o metal começa a emitir radiação eletromagnética no espectro visível — primeiro em tons avermelhados e, se aquecido ainda mais, em cores mais claras. Esse fe
83
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Memut
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