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A vela queima graças a um processo físico-químico muito interessante. O calor da chama derrete a parafina sólida, que é uma mistura de hidrocarbonetos. Essa parafina líquida sobe pelo pavio por capilaridade, um fenômeno em que o líquido consegue se deslocar por pequenos poros devido às forças de adesão e coesão. Ao subir, a parafina é vaporizada pelo calor da chama e reage com o oxigênio do ar em uma reação de combustão, produzindo principalmente dióxido de carbono , vapor de água e energi...
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