论文部分内容阅读
取一個一端封閉了的玻璃管A,在酒精灯上弯曲成右圖形狀,再裝入水銀,先使它充滿閉端a,然後由開管管口倒入很少量的液体(例如水),使管倾斜,让一小部液体进入a端(内部不能含有一點空氣泡)。把它插進一個裝有同樣液体(例如水)的烧瓶中,在瓶底加熱,使液体沸腾,於是a端的液體也開始化汽而將閉端水銀柱压下,我們可以看到閉端和开端的水銀柱在这時是相平的,这就說明了液体沸騰時的蒸汽壓强和當時的大气压强是相等的。这个實驗又简单又容易做並且看得很清楚。
Take a glass tube A closed at one end, bend it to the right shape on the alcohol lamp, and then load it with mercury. Fill it with a closed end a, then pour a small amount of liquid (such as water) , Tilt the tube and allow a small amount of liquid to enter a-end (the interior should not contain any air bubbles). Insert it into a flask containing the same liquid (eg water) and heat on the bottom of the bottle to boil the liquid so that the liquid on side a begins to vaporize and the closed end mercury column to depress. We can see the closed end and the open end Of the mercury column is flat at this time, which shows that the vapor pressure of the liquid when boiling is equal to the atmospheric pressure at that time. This experiment is simple and easy to do and see clearly.