OXIDACIÓ

CADENA OXIDADA.

COTXE OXIDAT.

BALDA OXIDADA.

METALL OXIDAT.

FERRO OXIDAT.

CANDAU OXIDAT.

Who was"Alexander Graham Bell"and wahat did he invent?
He was engineer and invented telephone.
Who was"Lovis Braille"and what did inventet?
He was linguist and invented braille alphabet.
Who was "Guglielmo Marconi"and what did he invent?
He was engineer and invented radio.

Henry Bessemer va ser un enginyer i inventor anglès.Va fer l'acer.(19 de gener 1813 hi el 15 de març 1898 va morir)

AIRE

La fraccio de oxigen del aire ambient es de aproximadament es 21%.

La fraccio de nitroge del aire ambient es de aprximadadament es 78%.