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First basic beer physics.

Beer contains carbon dioxide in solution at equilibrium (it doesn't want to come out of soluion). As the pressure in the beer is removed (you pop the tab or remove the cap) it seeks a new equilibrium concentration and some gas comes out of solution and the liquid foams up. Beer contains surfactants (chemical) that trap the gas in bubbles (foam). As the beer warms more and more gas comes out until the beer goes flat.

What else makes the gas come out?

If the beer is shaken, dropped, spilled or jostled the energy shakes some of the gas out of solution and the beer foams up.

If you put salt in the beer it changes that chemical composition of the beer and provides small particles for the bubbles to form around and the beer foams up.

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16y ago

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