Sun, Nov 11, 2007 - Page 14 News List

Sunday Science: Blowing up balloons 週日科學: 吹氣球

Welcome to Sunday Science! Every Sunday during the summer, we're going to guide you through some cool experiments that you can do at home. It's a good idea for you to keep a record of what you do in a Science Journal. That way you can record what you learn, compare results and maybe use them to design new experiments! Have a look at the Science Journal box for some ideas to get you started. Remember always ask a grown-up's permission before trying out an experiment.



Phew! Blowing up balloons can be really hard work. Why not make things a little easier using some simple science?

What you will need:

Several balloons

Some water or soda bottles (two large ones and two smaller ones)

Bicarbonate of soda

Hot water (from the tap is fine)

A lemon

A freezer

A spoon

Two containers for the lemon juice (glasses will do)

A lemon squeezer (optional)

Two large bowls

▲ Take one of the big bottles and carefully place a balloon over the mouth of the bottle. Make sure that no air can escape.

▲ Get another balloon. Stretch it, then place it over the mouth of the other big bottle.

▲ Put both of these bottles in the freezer. You should leave them there for about an hour.

▲ Take the lemon and slice it in half. Squeeze each half of the lemon into a different container so that you have equal amounts of lemon juice in each container.

▲ In the two smaller bottles, place three to four teaspoons of bicarbonate of soda in each bottle.

▲ Take out two more balloons. Stretch one out. This is the tricky part. You want to get the lemon juice into the bottles and then very quickly seal them with a balloon over the mouth of each bottle.

▲ Compare the two balloons. Which one worked best? Why do you think that might be?

▲ When the hour is nearly up, get the two bowls and half fill them with hot water. Be very careful that the water doesn't splash you. It's probably best if you ask a grown up to help you.

▲ Take the two big bottles out of the freezer. Do they look the same?

▲ Place the bottles in the bowls of hot water. Hold them there and wait to see what happens. Which balloon worked best? Why do you think that might be? (catherine Thomas, staff writer)

Next week 下週預告

For next Sunday's experiment you will need the following special items: Borax, cornstarch and child-safe glue.














▲ 小心地將一個氣球套在一個大寶特瓶的瓶口,確認空氣不會漏出來。

▲ 拿出另一個氣球,拉一拉,套在另一個大寶特瓶瓶口。

▲ 將這兩個瓶子放置冰庫內一個小時左右。

▲ 將準備好的檸檬切成兩半,分別將檸檬汁擠到兩個不同的杯中,這樣你就有了兩杯等量的檸檬汁。

▲ 各舀三至四茶匙的小蘇打粉到兩個小寶特瓶中。

▲ 再拿出兩個氣球,其中一個在用之前先拉一拉,這是這個實驗微妙的部份。將剛剛榨好的檸檬汁分別裝入小寶特瓶,然後用最快的速度將氣球套封上瓶口。

▲ 現在,比較看看兩個氣球,哪一個膨脹得又快又大?你猜想原因可能是什麼呢?

▲ 快到一個小時之前,將準備好的兩個碗裝入半碗熱水。裝水時一定要特別小心,不要被熱水燙到了,如果可以,最好請一個大人來幫你。

▲ 將冰庫裡的兩個大寶特瓶拿出來,兩瓶在外觀上有何差異嗎?

▲ 將它們各放到一個裝了熱水碗中,扶好寶特瓶,看看會有什麼變化產生。哪個氣球膨脹得又快又大?你猜想原因可能是什麼呢?


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