|Salad Dressing - Liquid Suspended in
- a jar with a tight cover
- a small bowl
- an egg beater
- a watch or a clock with a second
- 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
- 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
- Where does the oil go?
- What would weigh more, a cup of water or a cup
- Pour the dressing over a tossed green
- Mix well and enjoy.
Cobb, V. Science
Experiments You Can Eat (New York: Lippincott,