C_Skadi t1_j6ashc6 wrote
The crimp of the bottle cap engages with the lip of the bottle. This creates many points in contact with the bottle that can exert an equal and opposite force of the gas trying to escape. The cap is held in tension against the force applied by the pressure equally against the cap. The malleable cap will deform if torque is applied, freeing the contents to fill our glasses.
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