The factor that has changed inside the container would be the pressure.
Pressurized containers
Sodas in cans are preserved using a gas, carbon dioxide to be precise.
The gas is used to preserve the drink and sealed under pressure.
When a can of soda is opened, the first thing that escapes is the carbon dioxide gas. By doing so, the pressure in the can reduces.
More on canned soda and pressure can be found here: https://brainly.com/question/10301529
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