Txhua lub cev uas nyob ib puag ncig peb yog tsim los ntawm atoms. Atoms, nyob rau hauv lem, yog sib sau ua ke rau hauv ib tug molecule. Nws yog vim qhov sib txawv ntawm cov qauv molecular uas txhua yam khoom sib txawv ntawm ib leeg hauv lawv cov khoom thiab tsis muaj. Molecules thiab atoms yeej ib txwm nyob rau hauv lub xeev ntawm dynamics. Tsiv mus, lawv tseem tsis tawg nyob rau hauv ntau cov lus qhia, tab sis nyob rau hauv ib tug tej yam qauv, uas peb tshuav rau lub hav zoov ntawm xws li ib tug lossis loj ntau yam ntawm cov khoom nyob rau hauv tag nrho lub ntiaj teb no nyob ib ncig ntawm peb. Cov khoom no yog dab tsi?