Salad Dressing - Liquid Suspended in Liquid You Will Need: a jar with a tight cover a small bowl an egg beater a watch or a clock with a second hand a magnifying glass 1/3 cup vinegar 2/3 cup salad oil 1/4 teaspoon pepper 1/4 teaspoon garlic powder 1/4 teaspoon paprika 1/2 teaspoon salt Directions: Put all ingredients in the jar, except for the oil. Cover the jar and shake. Pour in the oil and let the mixture stand for a minute. Cover the jar and shake about 10 times. Use the watch to measure how long it takes the oil and water to separate. Cover the jar and shake about 20 times. Use the watch to measure how long it takes the oil and water to separate; compare this with your last result. Put the mixture in a small bowl and beat hard for about 4 minutes and examine the liquid droplets using a magnifying glass. Questions to Ask: What did shaking and beating do to the liquid? Where does the oil go? What would weigh more, a cup of water or a cup of oil? Consumption: Pour the dressing over a tossed green salad. Mix well and enjoy.

Bibliography Cobb, V. Science Experiments You Can Eat (New York: Lippincott, 1972).