Fogo
Autor: 5º ano F | Publicado: 2012-12-03T08:38:00-08:00

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De onde vem
o Fogo?

A combustão é o resultado da
reação química entre combustível e do seu oxidante, o comburente (O2, S2 etc.)
Dependendo do combustível e do comburente a chama (o fogo) possui cores
diferentes (fogos de artifício) conforme a mudança dos subleveis de energia dos
elétrons dos elementos envolvidos no processo.
O detalhe é que para iniciar a combustão é necessária certa quantidade de
energia de ativação. Os explosivos plásticos, por exemplo, possuem um estopim
de efeito mecânico que o aciona. Se o cara amassar ou colocar um fósforo para
acendê-lo não **** a explosão. Uma vez iniciada a combustão de uma pequena
parte do material, a energia gerada (calor e/ou mecânica) é suficiente para dar
continuidade ao processo.


Nome: Paulo e Diego