Takeappropriateamountofcorn(orrice)burstintoflowerpot,andclosedagoodroof,thenburstonthericepotonthestovesothattheycontinuetoturntheheatevenly,canbedeliciousouttothepopcorn. 　　Thisisintheheatingprocess,thepottemperaturerising,andthepotofgaspressureisalsoincreasing.Whenthetemperatureiselevatedtoacertainextent,thericegrainswillbegraduallysoftened,cookedricewithmostofthewaterintosteam.Duetohightemperature,watervaporpressureisgreat,sothathassoftenedtheexpansionofthericegrains.Butthistimethepressureinsideandoutsidethegrainofriceisbalanced,sograinofriceinthepotwillnotburstopen. 　　Whenthepotatmosphericpressureroseto4-5months,suddenlyburstopenthetopoftheflowerpot,potandtherapidexpansionofthegas,quicklyreducethepressure,makingthepressuredifferenceinsideandoutsidethericegrainsbecomelarger,resultinginagrainofricewithhigh-pressuresteamalsoTherapidexpansionofthetransientburstopengrainofrice,whichhasbecomethepopcorn.