which is heavier?

we experimented with water, oil and food coloring to discover which liquid is heavier and what happens when they are mixed together.

when the kids added food coloring to their mixture of water + vegetable oil, they were amazed to discover that while the food coloring mixed with the water, it did NOT mix with the oil! 

to demonstrate the effects of oil spills, we created a small ocean by adding feathers, shells, and plastic fish to blue water and then poured in vegetable oil. the kids observed that:

- the water and oil would not mix, no matter how fast or long we stirred
- the water stayed on the bottom and the oil stayed on top
- the feathers and shells got coated in oil
- nothing can drop into the water without getting oily

pretty amazing!

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