Project: Lava Cups
Concept: Floating Continued!
Today's project is a continuation of Tuesday's lesson - why things float. (So be sure to check out Tuesday's foil boats for a more thorough explanation.) We'll use the same concept to create groovy retro lava cups. Mrs. V is not a big fan of written tests, but what she does love is when students can see a demonstration and explain what's going on. So I'm putting you on the spot of how to explain this project to your kids. I'll be gracious with some hints :) One of my professors of education said his high school students referred to him as 'the benevolent dictator'. I always liked that approach.
|Materials needed: glass 3/4 full of water, 1/4 cup vegetable oil, 1 tsp salt, 5 drops of food coloring|
|It's debatable which is more fun - the actual experiment or the seriously cool food color art in the water!|
Pour all the vegetable oil into your colored water. You'll notice that when settled, the oil floats to the top.
Why is this?
|Is the vegetable oil more or less dense than water?|
|Color number 2. I think the lighter color made the movement easier to see, although red is fitting for a 'lava' cup.|
|Oil + Salt > Water|
|See the movement?|
|*Special thanks to sciencebob.com for some inspiration behind today's project!|