Why don't fill the can with cola fully

                    Everyone must know it.It is very popular drink such as teenager or adult always drink it when celebrating and child love it from sweat taste.

                     Then wouldn't you doubt that when you pick it up it isn't fill with cola fully it have some space or it just to decrease cost of production we will tell you why.                             

                                

                     In the can it is filled with cola and gas so if we fill it fully of cola then gas or CO2 would not have space and the can will be exploded when it absorb heat because of the gas enlarging.