Fri, May 09, 2008 - Page 20 News List

WEEKEND SCIENCE: The imploding can 鋁罐內爆

照片:台北時報

PHOTO: MICHAEL KEARNEY, TAIPEI TIMES

Today we’re going to make an aluminum can implode to show how powerful air pressure is. To do the experiment you’ll need an open flame (or something else that’s really hot), so make sure an adult helps out.

What you will need:

An aluminum can

A stove

Tongs

Water

A tablespoon

Ice

A bowl

► Fill the bowl with cold tap water. If the tap isn’t very cold, add some ice.

► Add about a tablespoon of water to the aluminum can.

► Using the tongs, hold the can over the stove. Wait for the water to boil and for copious amounts of steam to come out of the top of the can. Make sure an adult helps you with this part!

► Remove the can from the heat source, flip it over and dunk it in the cold water. The can should forcefully collapse.

(MICHAEL KEARNEY, STAFF WRITER)

今天我們要利用鋁罐內爆來示範氣壓的威力有多強大。這個實驗需要用到火(或其他很熱的東西),所以一定要請一個大人從旁協助喔。

所需材料︰

一個鋁罐

一個爐子

火鉗

一個大湯匙

冰塊

一個碗

►在碗裡裝滿自來水冷水,如果自來水不是很冷,就在裡面加一點冰塊。

►在鋁罐中加入大約一大湯匙的水。

►用火鉗夾住鋁罐,然後放到爐火上,直到罐子裡的水滾,並冒出大量蒸氣。一定要請一個大人幫你做這個步驟!

►把鋁罐從火源上方移開,並將罐子倒過來浸泡到準備好的冷水中;罐子應該會瞬間凹陷。

(翻譯︰袁星塵)

Bonus 你知道嗎

Have you ever noticed the “whoosh” sound that happens when you open a bag of potato chips or anything else that is vacuum packed? That’s the sound of air rushing into the bag. The air inside the bag is at a lower pressure than the air outside the bag, so to attain equilibrium air rushes in.

你打開洋芋片包裝或是其他真空包裝時,有聽到「嘶嘶聲」嗎?那是空氣灌進包裝的聲音,包裝內的氣壓較包裝外的氣壓低,因此為了維持氣壓平衡,空氣便會灌入袋中。你知道嗎

Further ideas 進階點子

Since there’s already an adult around, here’s another experiment you can try that also uses fire. All you’ll need is a couple balloons, a lighter or matches and water.

First blow up a balloon and tie it. Now try holding a flame against the balloon. What happens?

Next put a couple hundred milliliters of water into a balloon, blow it up and tie it. Now try holding a flame against the balloon where the water is. What happens? Why do you think that is?

既然有一個大人在旁協助,你還可以順便做另一個會用到火的實驗。你需要準備兩三個氣球、一個打火機或火柴和水。

首先,吹一個氣球,然後綁好,再用火燒氣球,結果會怎樣?

接著在一個氣球內裝入兩三百毫升的水,將氣球吹起後綁好,再用火燒氣球有水的部分,結果呢?你認為其中的原理是什麼?


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