You've probably seen fire extinguishers around, but do you know how they work? Today we're going to do an experiment that shows how fire extinguishers can put out a flame by depriving it of oxygen.
What you will need:
Candles
A lighter or matches (Get help from your parents when lighting the candles.)
A bowl
A small plate
Baking soda
Vinegar
★ You need to cut the candles so they're different lengths, and both need to be shorter than the bowl.
★ Fill the plate with baking soda, and place it into the bowl.
★ Stand the candles up in the baking soda.
★ Light the candles.
★ Pour vinegar into the baking soda. Be careful not to pour vinegar onto the flame.
★ Watch the candles. The short one should go out before the large one. If neither one goes out, try adding more vinegar. Don't forget to record your observations in your science journal.
(MICHAEL KEARNEY, STAFF WRITER)
你也許看過週遭的滅火器，但你知道它們為什麼可以滅火嗎？今天我們要來實驗看看滅火器如何隔絕氧氣、撲滅火焰。
所需材料︰
蠟燭
一個打火機或火柴（請父母幫你點燃蠟燭）
一個碗
一個小碟子
小蘇打
醋
★ 你需要兩根不等長的蠟燭，但是這兩根蠟燭都必須短過你準備的碗。
★ 在小碟子中裝滿小蘇打粉，再一起放入碗中。
★ 把蠟燭直立置放在小蘇打上。
★ 點燃蠟燭。
★ 把醋加入小蘇打粉中，小心不要將醋倒到火焰上。
★ 觀察蠟燭，短的那根應該會比長的早熄滅；如果兩根都沒熄滅，可以再加一點醋試試看。別忘了在《科學日誌》中記下你的觀察。
（翻譯 �袁星塵）
1. fire extinguisher n.
滅火器 (mie4 huo3 qi4)
2. deprive v.t.
使…喪失 (shi3 … sang4 shi1)
3. baking soda n.
小蘇打 (xiao3 su1 da3)
4. fire hydrant n.
消防栓 (xiao1 fang2 shuan1)
5. chemical reaction n. phr.
化學反應 (hua4 xue2 fan3 ying4)
6. carbon dioxide n.
二氧化碳 (er4 yang3 hua4 tan4)
7. smother v.t./v.i.
悶熄 (men1 xi2)
8. equation n.
方程式 (fang1 cheng2 shi4)
9. foam n.
泡沫 (pao4 mo4)
10. grease n.
油脂 (you2 zhi1)
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