OK, this is seriously the coolest project we've done. The pictures don't do it justice at all - you'll really have to try this one yourself. I did this with the kiddos a few weeks ago and they loved it. I gave them a little science lesson while we did it of why oil and water don't mix, but it probably went a little over their heads, lol. This was a really fun project and I already had everything I needed for it except the alka seltzer, which was pretty cheap. I love that you can put the lid back on when you're done to save it for another day. You can also turn this into a lava lamp if you put a light underneath it. Here's how we made it:
What you'll need:
clear plastic or glass bottle
1. Take the lid off your bottle. Make sure your bottle is clean and fill it about 1/8th full with water.
2. Fill the rest of the bottle with baby oil until nearly full - watch the oil and water separate - very cool!
3. Slowly add drops of food colouring a couple at a time - this step is really neat - the food colouring stays in little balls as it drops through the oil and then pools where the water and oil meet - gradually these little balls burst and fill the water with colour
4. When the food colouring has mixed with the water, break up an alka seltzer tablet into a few pieces and drop the pieces in and watch the magic happen. The pictures don't do this justice at all and I couldn't photograph this for the life of me without getting a light reflection on the bottle. I even moved locations and it didn't work.
5. You can repeat step #4 until your little heart's content and when you and the kiddos have had enough, put the lid back on for another day.
Experiment from Science Bob
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