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Lesson 26: Keep the Candle Burning
第26課 保持蠟燭燃燒
Science is so interesting! I'm sure you'll like this experiment!
科學如此有趣！我敢肯定你會喜歡上這個實驗的！
What do you need?
你需要什么？
a candle
一支蠟燭
a candle holder
一只燭臺
a big glass jar
一個大玻璃瓶
a shallow dish
一個淺盤子
some water
一些水
a lighter or matches
一個打火機或一些火柴
What do you do?
你要做什么？
1. Put the candle in the candle holder.1
將蠟燭放在燭臺上。
2. Put the candle holder on the dish.2
將燭臺放進盤子里。
3. Fill the dish half full with water.3
將盤子里注滿水。
4. Light the candle.4
點燃蠟燭。
5. Let the candle burn for two or three minutes.5
讓蠟燭燃燒2-3分鐘。
6. Carefully put the jar over the candle until the top of the jar rests on the dish.6
仔細地將瓶子放在蠟燭上方直至瓶口落在盤子里。
7. Examine the water in the jar. What can you see?7
觀察瓶中的水。你能看到什么？
What is happening?
發生了什么？
As the candle burns, it uses the oxygen in the air.
當蠟燭燃燒時，它消耗空氣中的氧氣。
When the candle stops burning, it has used up all the oxygen in the air.
當蠟燭熄滅，空氣中的氧氣也就用完了。
The water inside the jar rises. How far does the water rise?
瓶中的水會上升。水升高了多少？
Because about one fifth of the air is made up of oxygen,
因為空氣中的氧氣占了五分之一，
the water rises and fills about one fifth of the jar.
那么，水升高并占據了瓶子（容積的）五分之一。
Can you do this experiment?
你會做這個實驗嗎？
