一些Distillation既問題...help!!!

In distillation, a thermometer is used to measure the boiling point of the liquid component (i.e. the temperature of the vapour). A thermometer is usually fitted because the such a boiling point is usually needed to be known. However, if you don't care about the boiling point, a temperature may not be fitted.
在蒸餾中，溫度計用以量度液態成分的沸點（即蒸氣的溫度）。因為一般要知道沸點，所以通常都會安裝溫度計。但若果你不理會沸點，可以不裝上溫度計。

When the steam is cooled down to a temperature below the boiling point of water (100°C), it is condensed to liquid water.
當蒸氣冷卻至低於水的沸點的溫度（100°C），凝結成液態水。

If water goes into the water jacket of the denser at the bottom, water will fill up the water jacket from bottom to top and leave the water jacket at the top. Therefore, the water jacket of the condenser is fully filled with water.
If water goes into the water jacket at the top, due to gravity, water will fall to the bottom and leave the water jacket rapidly. Therefore, the water jacket would not fully filled with water. Consequently, the cooling effect is lowered.
若果水由底部進入冷凝器的水套，水會由底至頂的充滿水套後，由頂部離開水套。因此，水會充滿冷凝器的水套。
若果水由頂部進入冷凝器的水套，由於地心吸力，水會迅速跌至底部離開水套。因此水套不會充滿水，結果令冷卻效能降低。

1.溫度計係用來睇住個溫度，免得過熱，我都係唔係幾清楚。
2.係，當蒸汽降低溫度就變成水，因為同平時一樣，如果你要將一條魚蒸熟，你會將佢罷入碟，然後攞去蒸，你唔會倒水入去，因為蒸熟之後，煲嘅蓋會滿灑水點，然後佢地會趺落來。這個道理同Distillation一樣。
3.冇規定加，可以，不過呢個就比較難解釋啲。
1.Thermometer use to look at the temperature,don't let it too hot,actually I am also not understand about it.
2.Yes,when the steam cool down,it will change to water,same as usual,if you need to use the steam to make the fish ripe,you will put it in the plate and use the steam to cook it,you won't pour water in the plate due after this way,the bowl's cover will full of water drops and they will fall down.This reason is same as the Distillation
3.There are not rule,but it is too difficult to answer.