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在講述“大氣壓随地方的高度而不同”這一課時,學生常會聯想到:樓上與樓下的高度有了不同,大氣壓也應該有改變;可是在水銀氣壓計與無液氣壓計上却看不出明顯的改變。為了解決這個困難,我們設計並自製了“水氣壓計”這個簡單的儀器,同時我們又利用它測量校旁小山的高度。最初我們用一個平底燒瓶,注入少量的水(含有紅或藍色的墨水),用橡皮塞把燒瓶口塞緊,取細長玻管穿過皮塞並使管口插入水中。自玻管吹入少量空氣,使水柱能因瓶內氣壓增加升至燒瓶口上,以刻度尺附於玻管上,其裝
When it comes to the lesson that “the atmospheric pressure varies with the height of the place”, students often think of the difference in height between the upper floor and the lower floor, and the atmospheric pressure should also change. However, on the mercury barometers and aneroid barometers, A clear change. In order to solve this difficulty, we designed and made a simple “water pressure gauge” instrument, and we use it to measure the height of the hillside school. Initially, we used a flat-bottomed flask, filled with a small amount of water (containing red or blue ink), squeezed the flask port tightly with a rubber stopper, and inserted the slender glass tube through the plug and inserted the nozzle into the water. A small amount of air blown from the glass tube so that the water column can be increased due to the bottle pressure rose to the mouth of the flask to scale attached to the glass tube,