Lesson 26: Keep the Candle Burning

第26课 保持蜡烛燃烧

Science is so interesting! I'm sure you'll like this experiment!

科学如此有趣！我敢肯定你会喜欢上这个实验的！

What do you need?

你需要什么？

a candle

一支蜡烛

a candle holder

一只烛台

a big glass jar

一个大玻璃瓶

a shallow dish

一个浅盘子

some water

一些水

a lighter or matches

一个打火机或一些火柴

What do you do?

你要做什么？

1. Put the candle in the candle holder.1

将蜡烛放在烛台上。

2. Put the candle holder on the dish.2

将烛台放进盘子里。

3. Fill the dish half full with water.3

将盘子里注满水。

4. Light the candle.4

点燃蜡烛。

5. Let the candle burn for two or three minutes.5

让蜡烛燃烧2-3分钟。

6. Carefully put the jar over the candle until the top of the jar rests on the dish.6

仔细地将瓶子放在蜡烛上方直至瓶口落在盘子里。

7. Examine the water in the jar. What can you see?7

观察瓶中的水。你能看到什么？

What is happening?

发生了什么？

As the candle burns, it uses the oxygen in the air.

当蜡烛燃烧时，它消耗空气中的氧气。

When the candle stops burning, it has used up all the oxygen in the air.

当蜡烛熄灭，空气中的氧气也就用完了。

The water inside the jar rises. How far does the water rise?

瓶中的水会上升。水升高了多少？

Because about one fifth of the air is made up of oxygen,

因为空气中的氧气占了五分之一，

the water rises and fills about one fifth of the jar.

那么，水升高并占据了瓶子（容积的）五分之一。

Can you do this experiment?

你会做这个实验吗？