有關distillation

因為呢如果你d水響upper opening入既話,好快就會流走
相反,響lower opening入水,水位上到upper opening個口先流走
以免長期開著水做實驗,浪費水

the water comes out from the lower opening easily because of the gravity.then,we must keep the water running from the tap.in opposite,the water goes in from the lower opening and comes out from the upper opening when the water level is above the upper opening.also,it can use less water.

Because when water heated , the water will become steam, and the hot steam
will go up to the condenser, then the steam will cool down and become water