le ▁in ▁this ▁way , ▁it ▁is ▁claimed ▁by ▁most ▁of ▁those ▁who ▁sell ▁the ▁device , ▁prevents ▁the ▁drink ▁from ▁going ▁flat . ▁ ▁As ▁Joseph ▁A . ▁Schwar cz , ▁Brian ▁Ro hr ig ▁( of ▁East mo or ▁Academy ), ▁John ▁P . ▁Williams ▁( of ▁Miami ▁University ▁Hamilton ), ▁Sand y ▁Van ▁N atta , ▁Reb e cca ▁K ni pp , ▁and ▁Re ed ▁A . ▁How ald ▁all ▁explain , ▁the ▁mechanism ▁does ▁not , ▁in ▁fact , ▁operate ▁in ▁this ▁fashion ▁because ▁of ▁Henry ' s ▁Law ▁and ▁Dal ton ' s ▁Law . ▁ ▁Description ▁When ▁a ▁soft ▁drink ▁bott le ▁is ▁carbon ated , ▁it ▁is ▁press ur ized ▁with ▁carbon ▁dio x ide ▁to ▁higher ▁than ▁the ▁ambient ▁atmos pher ic ▁pressure . ▁ ▁Event ually ▁the ▁dissol ved ▁CO 2 ▁and ▁the ▁CO 2 ▁in ▁the ▁head space ▁above ▁the ▁liquid ▁reach ▁a ▁dynamic ▁equilibrium , ▁where ▁the ▁amount ▁of ▁CO 2 ▁dissol ving ▁in ▁the ▁liquid ▁equals ▁the ▁amount ▁of ▁CO 2 ▁esc aping ▁the ▁solution ▁into ▁the ▁head space , ▁at ▁a ▁pressure ▁of ▁approximately ▁ 2   at mos pher es . ▁ ▁The ▁bott le ▁remains ▁in ▁this ▁dynamic ▁equilibrium ▁until ▁the ▁first ▁time ▁that ▁the ▁cap ▁is ▁removed . ▁ ▁The ▁first ▁time ▁that ▁the ▁cap ▁is ▁removed ▁from ▁the ▁bott le , ▁the ▁pressure ▁inside ▁the ▁bott le ▁equal izes ▁with ▁the ▁ambient ▁atmos pher ic ▁pressure . ▁ ▁More ▁important ly , ▁however , ▁after