Liquid Density Experiment

Materials:

• 3 clear containers (such as mason jars)
• 1 large container
• heavy liquid (like honey, corn syrup, or molasses)
• water
• vegetable oil
• food coloring
• household items: coins, plastic beads, bottle caps, popcorn, grapes, safety pins...

Procedure:

• Pour a cup of each liquid into the containers.
• Use the food coloring to dye the liquids.
• Guess which liquid will rise to the top when you mix all of them together.
• Pour all the liquids into one jar and wait for them to separate.
• Then predict how far each household item will fall inside the container.
• Add in the household items one by one and see if you guessed correctly!

Explanation:

• Density is equal to the mass of the substance divided by the volume.
• When you pour all of the liquids together, liquids with heavier density will sink, while liquids with lighter density will rise to the top.
• When you add the household items in, the ones with more mass per unit volume will sink lower than the ones with less mass per unit volume.

Reference:

http://www.schoolingamonkey.com/easy-science-experiments-for-kids-discover-liquid-density/