Question

define corrosion why do copper vessels turn green with the passage of time​

Answer 1

Copper turns green because of chemical reactions with the elements. Just as iron that is left unprotected in open air will corrode and form a flaky orange-red outer layer, copper that isexposed to the elements undergoes a series of chemical reactions that give the shiny metal a pale green outer layer called a patina.

Answer 2

hey mate here is your answer

The eating of upper layer of metals due to action gases, acids etc. is known as corrosion.

the copper vessels turns green because of formation of basic Copper carbonate on its layer.

It will surely help you.