本期我们要让烟花在水中绽放,这个实验只需要以下物品:
a jar or glass罐子或玻璃杯
cooking oil食用油
water水
food coloring食用色素
Step 1. Fill the jar 3/4 of the way full with warm water.
在罐子里装满3/4的温水。
Step 2. In a separate bowl, add drops of food coloring of different colors to cooking oil.
在另一只盛有油的碗里加入不同颜色的食用色素。
Step 3. Gently mix the oil and food coloring together until small beads of color form.
轻轻地搅动,让油和色素混合在一起。
食用色素是不会溶于油的,所以看到色素变成了一个个的小颗粒就可以了。
Step 4. Slowly pour the oil mixture into the jar.
慢慢地把油倒入罐子中。
Step 5. Watch what happens: the food coloring will slowly sink out of the oil and into the water.
仔细观察:食用色素会慢慢地沉入到水中。
When this happens,it will expand and begin to mix with the other colors.
在这个过程中,色素会慢慢散开并和其他颜色混合在一起。
本期的科学关键词是dissolve(溶解)。
食用色素溶于水,但不溶于油。
Food coloring dissolves in water but not in oil.
带有颜色的小颗粒比油要重,所以开始往下沉。
The colored droplets are heavier than oil, so they begin to sink.
一旦沉到水中,食用色素就开始溶于水。
Once they sink into the water, they begin dissolving into the water.
在实验过程中,让孩子接触一下英语分数(fraction)的表达。
试着让孩子记住最简单的几个表达,例如:
1/3one-third
2/3two-thirds
1/4one-quarter
3/4three-quarters
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