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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

水

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

Vocabulary 今日單字 1. aluminum n. 鋁 (lü3) 2. implode v.t./v.i. 內爆 (nei4 bao4) 3. tongs n. 火鉗 (huo3 qian2) 4. copious adj. 大量的 (da4 liang4 de5) 5. dunk v.t./v.i. 浸泡 (jin4 pao4) 6. argon n. 氬 (ya4) 7. condense v.t./v.i. 凝結 (ning2 jie2) 8. vacuum n. 真空 (zhen1 kong1) 9. equilibrium n. 平衡 (ping2 heng2) 10. milliliter /ʻmɪlɪ,litɚ/ n. 毫升 (hao2 sheng1)

Science Journal 科學日誌 We’re surrounded by air. What is air made up of? How much pressure does air exert at sea level? Why aren’t all things just crushed by air? What happens to air molecules at high temperatures? How does an increase in temperature affect pressure? 我們四周充滿了空氣，空氣是由什麼組成的？海平面承受了多少大氣壓力？為什麼萬物不會被空氣壓垮？空氣分子在高溫下會產生什麼變化？溫度升高對氣壓又有什麼影響？

What’s the Science? 科學原理 Air is mostly made up of nitrogen and oxygen, along with other gases such as argon. The pressure these gases exert on us at sea level is about one kilogram per square centimeter. That’s a lot of weight pushing against us, but our bodies are filled with air that pushes against the air outside to balance everything out. Under normal conditions the air pressure is the same inside and outside the can. When you heated the water inside the can, vapor formed and pushed the air inside the can out. Flipping the can over and dunking it in cold water caused the water vapor to condense and a temporary vacuum to form. The air pressure outside the can was much greater than the air pressure inside the can, which caused the can to implode. Some water from the bowl might have rushed into the can, but the water wouldn’t be able to rush in fast enough to stop the can from imploding. 空氣主要由氦氣、氧氣及其他如氬氣等氣體組成。海平面的大氣壓力約為每平方公分一公斤，這樣的壓力對我們來說相當沉重，但還好我們身體裡面也充滿空氣，如此一來就抵銷了外面空氣施予我們的壓力。 在一般情況下，罐子內外的氣壓是一樣的。當你加熱罐中的水，水受熱後形成水蒸氣，水蒸氣會將罐內空氣擠出罐外；把罐子倒過來放到冷水中後，水蒸氣會凝結形成暫時性的真空；罐外的氣壓比罐內的氣壓大出�?A罐子因此內爆。 碗中有些水可能會瞬間竄入罐中，但是水竄入罐子的速度不及罐子內爆的速度。

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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