佢係接近絕對零既時候先會變成液體，
同埋係一個大氣壓力下唔會有固態．．．
點解佢會咁特別 ？
同佢既電子排佈 ( 2 ) 有冇咩特別關係 ？
點解 "helium" 係一種咁特別既 atom !!!!
2006-12-07 4:24 am
回答 (2)
2006-12-07 5:01 am
✔ 最佳答案
其實如果係change of state 係同佢個 physical property事...一物質如果要改變佢個state,其實係同佢的atom的"密度"有關,而要令atom排得密d 1)降低溫度→動能 decrease(atom 震的幅度減少)→排得密d
2)加大壓力→atom 震的幅度減少→排得密d
因為helium 個原子核好細,所以要好低溫先可以令helium atom 的動能降低到可以變成液體
K.E=1/2m(v)square.你俾好少能量粒helium atom 佢就會有好大的 velocity.so 要好大的壓力先可以令減低個velocity...so 1atm 係唔夠的....
2006-12-09 7:17 am
Since helium has only 1 electron shell, when 2 helium get close together, there is great repulsion between thier nucleus. Thus, a lot of energy needed to be provided to force them get even closer (changing of physical state). I think you can think this way also
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