Have you ever noticed how a slick of oil on a puddle can have a rainbow of colors? This week we're going to make our own colorful oil slicks.
What you will need:
a black bowl (or a bowl with the inside covered in black paper)
a sink
a desk lamp (optional)
various kinds of oil (note that sesame oil works well)
toothpicks
rubber bands
▲ Fill the bowl with water and leave a thin stream of water slowly running over the bowl. This will help clean away the oil. Make sure that the stream is thin enough that no waves are created.
▲ Shine the light on the ceiling above the sink. If the room is very bright, this won't be necessary.
▲ Dip the end of a toothpick into the oil. Now add a drop of oil to the water. The oil will form a thin film on top of the water. Watch how the light reflects off the oil slick. Try looking at it from different angles.
▲ Try using different types of oil. Some work better than others. Use a different toothpick for each type of oil.
▲ Try floating a rubber band on top of the water. Add a drop of oil to the middle of the rubber band. Wait a few seconds and then lift up one end of the rubber band.
▲ Try adding two oil drops and see how they interact.(MICHAEL KEARNEY, STAFF WRITER)
你曾經注意過地面上的漂有浮油的水面會反映出彩虹般的色彩嗎？本週我們要來自製七彩繽紛的水面浮油。
所需材料︰
一個黑色的碗（或是在有顏色的碗上舖一層黑紙）
水槽
一盞桌燈
多種不同種類的油（麻油的效果尤佳）
牙籤
橡皮筋
▲ 將碗中裝滿水，並讓保持微弱水量持續流入碗中，這樣可以讓油流走，注意水要開得夠小才不會在水面上產生波紋。
▲ 將燈光對著水槽上方的牆壁打。如果房間已經很亮了，可以省略這個步驟。
▲ 用牙籤末端浸入油中，用牙籤在水中點一滴油，油會在水面上形成一層薄膜，注意觀察浮油在燈光下的變化。
▲ 嘗試用不同種類的油實驗，有些效果比較好，每換一種油就要換一根牙籤喔。
▲ 放一根橡皮筋在水面上，然後在橡皮筋中間輕點一滴油，數秒後，挑起橡皮筋一端。
▲ 加入兩滴油，看看他們會怎麼互相作用。
（翻譯︰袁星塵）
For next Sunday's experiment you will need the following special items: a thermometer, a measuring jug, and ice (homemade or store bought, about two bags worth).
下週日的科學實驗，需要特別準備以下的東西︰一個溫度計、一個量杯和冰塊（自製或向商店購買均可，需約兩包的量）。
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