oxidació

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who was "alexander graham bell" what a did he invent?
He was Scientist and he Invented Telephon.
Who was"Lavis Braille"and What did he invent?
He was a French linguist and he invented Reading for Blind.
Who was "Guglileno Marconi"and what did he invent.
He was Inventor and what did invent comunication Thelegraphic.

l'henry bessemer ( 19 de gener 1813 hi va morir al 15 març 1898)
va inventar l'acer.

quant oxigen hi ha a l'aire?
aproximadament 21% d'oxigen el 1% de CO2 76% de nitrogen
a l'aire.