Why is soda-pop pressurized?

Question

Whenever you open a can of soda, you can hear the pressurized air escaping from the can. Why is air and soda pressurized into that can?

Answer 1

Soda (or Pop) is not pressurized during packing. The gases released from the carbonation expand and therefore take up space in the bottle (or can) during shipment, stocking and handling. Once it fills the small air-space in the bottle/can they start to compact together. Thus, when you open the bottle or can, the gases rush out causing pressure againest the lid/cap.

Example:

Top Section

o o o o o o
o o o o o o
o o o o o o

--------------

Middle Section

oo oo oo oo
oo oo oo oo
oo oo oo oo

--------------

Bottom Section

ooooooooo
ooooooooo
ooooooooo


The set of "o"'s on the top section represent how much space is between each particle of gas at the very early stages of the gases being released. As the carbonation continues to release more particles of gas they become closer together (the middle section "o"'s). And just before you open the bottle, the particles are so close together (the "o"'s on the bottom section) that they cause a pressured force as you open the soda/pop.

I hope that answers your question.

Answer 2

In many consumer beverages such as soft drinks (well known examples include Coca-Cola, 7 Up and Pepsi), carbonation is used to give "bite".

Contrary to popular belief, the fizzy taste is caused by the dilute carbonic acid inducing a slight burning sensation, and is not caused by the presence of bubbles.

This can be shown by drinking a fizzy drink in a hyperbaric chamber at the same pressure as the beverage.

This gives much the same taste, but the bubbles are completely absent.

Carbonation is sometimes used for reasons other than consumption, to lower the pH (raise the hydrogen ion concentration) of a water solution, for example.

Answer 3

To keep it fresh.it would be flat if it did not have that air in there.

Answer 4

to keep the bubbles in

that is why an opened bottle of pop goes flat