How long does it take for unopened carbonated soft drink to ‘cool down’ after being shaken? And does tapping the can/bottle actually help or is it just an urban myth?

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In: Chemistry

The cause of the mess when you shake a can of soft drink isn’t the temperature or amount of pressurized gas, it’s where the gas is.

When the gas is all at the top, it comes out in a puff with no spill. When the gas is bubbles below the surface line, releasing the pressure expands the bubbles and lifts the liquid above them = spray of soft drink.

Tapping does help, as it allows bubbles along the side of the can to slide up to the surface and pop.