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Lava 'lamp' fun 週日科學：自製繽紛熔岩燈
Welcome to Sunday Science! Every Sunday, 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 to always ask a grown-up's permission before trying out an experiment.
歡迎閱讀《週日科學版》！我們每週日都要為你介紹可以在家中進行的有趣科學實驗。你可以在《科學日誌》中 記錄自己做了哪些活動，這樣就可以將所學的紀錄下來，比較這些結果，也許還可以利用它們來設計新的實驗！先看一下《科學日誌》的點子再開始吧。展開實驗之前，記得要獲得大人許可喔！
Sunday, Mar 16, 2008,Page 14
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照片：CATHERINE THOMAS
PHOTO: CATHERINE THOMAS, TAIPEI TIMES
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Have you ever seen a lava lamp? This week we are going to have our very own funky homemade lava fun! Make sure you wear old clothes and work in the kitchen, as this experiment can get very messy!
What you will need:
a glass jar
salt
vinegar
water
food coloring
vegetable or baby oil
sodium bicarbonate
a bright lamp or a torch
glitter (optional)
★ Fill the jar a quarter full of water.
★ Now add two quarters of vegetable oil. You should still have a quarter of the space left at the top of the jar. Do the oil and the water mix?
★ Add several drops of food coloring. Watch what happens. Where do the drops go? Do they mix with the other fluids?
★ Drop in a tablespoon of bicarbonate of soda. Where does it go and how does it act?
★ Add a tablespoon of vinegar. Where does the vinegar go?
★ Wait for everything to settle.
★ Now add a large pinch of salt. Watch what happens.
★ Wait for the mixture to settle. Now add some more salt.
★ Try shining the lamp or torch behind the lamp.
★ If you like you can add some glitter now. Where does the glitter sit in the mix?
(CATHERINE THOMAS, STAFF WRITER)
你看過「熔岩燈」嗎？本週我們要來體驗自製時尚熔岩燈的樂趣！務必穿舊衣服在廚房進行這個實驗，因為過程會很髒亂唷！
所需材料︰
一個玻璃瓶
鹽
醋
水
食用色素
沙拉油或嬰兒油
碳酸氫鈉（小蘇打）
一盞亮燈或是一個手電筒
亮粉（非必要）
★ 在玻璃瓶內裝入四分之一滿的水。
★ 接著再加入四分之二的沙拉油，此時你的瓶子應該還剩四分之一的空間；油和水會混在一起嗎？
★ 滴入幾滴食用色素，仔細觀察有什麼變化產生，色素滴入後會跑到哪裡？會和瓶中其他液體混合嗎？
★ 加入一大湯匙小蘇打粉，小蘇打粉會在瓶中哪處？又會起什麼作用？
★ 再加入一大湯匙的醋，醋會流到何處？
★ 靜置，等所有的東西都沉澱下來。
★ 加入一大撮鹽，觀察其變化。
★ 等瓶中混合液體靜止後，再加入一些鹽。
★ 試著用燈或手電筒從後方照射玻璃瓶。
★ 如果你有準備亮粉，現在可以把它們加進去，亮粉會跑到哪裡去呢？（翻譯：袁星塵）
| Vocabulary 今日單字 |
1. lava lamp n.
熔岩燈 (rong2 yan2 deng1)
2. pinch n.
少量 (shao3 liang4)
3. shine v.i./v.t.
照向 (zhao4 xiang4)
4. foil stars n.
星型亮片 (xing1 xing2 liang4 pian4)
5. reaction n.
反應 (fan3 ying4)
6. dissolve v.i./v.t.
溶解 (rong2 jie3)
7. immiscible adj.
不相混合的 (bu4 xiang1 hun3 he2 de5)
8. layer n.
層 (ceng2)
9. blob n.
一點 (yi4 dian3)
10. display n.
表演 (biao2 yan3)
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| Science Journal 科學日誌 |
| Which is heavier, oil or water? What about oil or salt? Do water and oil mix? Does salt dissolve in water? Does salt dissolve in oil? What happens when you mix vinegar and sodium bicarbonate?
油和水哪種比較重？油和鹽呢？油和水會相混合嗎？鹽會溶解於水嗎？鹽會溶解於油中嗎？當你把醋和小蘇打粉混合後，會產生什麼變化？
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| What's the science? 科學原理 |
| Oil and water are immiscible. When you put the oil and the water together they settle into two separate layers. Vinegar is lighter than water, but heavier than oil, so it sits in the middle. The food coloring is mainly water, and so it also sinks in oil. Salt is heavier than oil. When you add the salt it sinks through the oil, taking blobs of oil with it. When these reach the water the salt dissolves in the water and the oil is released. The oil then makes its way back up to the top, taking blobs of food coloring with it. As the oil moves it helps the bicarbonate of soda and vinegar mix. This releases gas which forces blobs of food coloring and glitter through the mixture. What a display!
油和水不會相混合，所以當你將油和水裝入同一個容器時，它們會分成上下兩層；醋比水輕，但比油重，所以醋會介在兩者之間。食用色素的主要成份是水，所以它會沉入油下方。鹽比油重，所以加進鹽後，它會沉到油的下方，並順道帶走一些油；下沉的鹽碰到水會溶解，被鹽帶下的油卻不會，這些被釋出的油向上浮升時，會帶走一些食用色素；油移動時會帶動小蘇打粉和醋相混合，其排放的氣體會讓食用色素和亮粉佈滿這瓶混合液體，看起來真是精采！
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