This week we're going to make a funky milk kaleidoscope. You're sure to want to show this off to your family and friends, so it's probably best that you work out which kaleidoscope works best, then you can make a big one. Be careful, food coloring can stain your clothes.
What you will need:
PHOTO: CATHERINE THOMAS, TAIPEI TIMES
Several small bowls or pie plates
Different types of milk (whole milk, low fat milk, soy milk etc.)
A bamboo skewer or a toothpick
+ Each dish should have at least 3cm of fluid in it. Use a different dish for each fluid. Use milk, low fat milk, soy milk and water. Put a large drop of cooking oil in the center of the water.
+ Line the dishes up so that you can see them all. Now very gently bring the food dye as close to the surface of each of the fluids as possible and put one drop of each color at 12 o'clock, 3 o'clock, 6 o'clock and 9 o'clock. Be very careful not to knock or disturb the samples.
+ Place some dish detergent on a small plate. Dip the skewer in the detergent and very carefully poke the skewer just into the surface in the middle of the first sample. Hold the skewer still and watch.
+ Redip the skewer and repeat in all samples. The reaction will keep on going for up to five minutes. Be patient!
+ Compare and contrast what happens in each case.
+ Choose the best two reactions and repeat the experiment, only this time poke the water with a clean (no detergent) skewer, then follow up with three or four drops of detergent onto the air bubble the skewer leaves.
Don't forget to record what happens in your Science Journal.(catherine Thomas, staff writer)
What's the science? 科學原理
Milk is made up of water (polar), sugars and salts (polar) and fats and lipids (nonpolar). The molecules in dish detergent are also both polar and nonpolar. When you add the detergent to the milk, a "current" is created by the attractions and repulsions between the polar and nonpolar properties of the molecules. The food coloring is moved by this and so you can see a kaleidoscope effect.
Science Journal 科學日誌
Do you know what milk is made up of? Is oil similar to the fat in milk? What do you know about dish detergent? What do you think might happen if you mix milk and dish detergent?
Further ideas 進階點子
What happens if you add some oil to the milk? How do the colors react? How about replacing the dish detergent with shampoo? Shower gel? Liquid hand soap? Try moving the toothpick around in the samples. What happens? If you like you can save your results by lightly placing a coffee filter on the surface. Lift it off and leave it to dry.
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