✔ 最佳答案
你想知molar mass還是每一立方米有多重?
2008-01-05 22:29:06 補充:
空氣成份: 20%O2 80%N2 others particle(can be ignored)molar mass of O2 =16.0g/molmolar mass of N2 =14.0g/molmolar mass of air =16.0g/mol x 20% 14.0g/mol x 80% = 14.4g/mol按阿佛加德羅定律(Avogadro's law), 1 mole 空氣份子的體積是24dm^3=0.024 m^3每一立方米空氣重 14.4x(1/0,024) =600g
2008-01-06 11:58:49 補充:
樓下"shekkuihong"wrong concept氣壓是指空氣粒子1秒撞擊物件多少次, 並非重量e.g.單車輪呔的氣壓重10磅, 但輪呔的重量則遠低於10磅以上的數字全都是以室溫, 1個大氣壓力的還境為準
2008-01-09 22:14:26 補充:
唔記得左乘2, 因為係N2, O2
要乘番大佢