Please read further for instructions and explanations.

First, we apologize for the spelling error for "Vinegar" in the video.

You'll need:
A clear plastic bottle
Vegetable oil
Food coloring
Baking Soda
Vinegar
A funnel

Instructions:
1. Scoop about a tablespoonful of baking soda into the plastic bottle.
2. Pour in vegetable oil until the bottle is nearly full.
( For steps 1 & 2, you might want to use a funnel when filling the bottle so you don't spill anything).

3. Add around a dozen drops of colored vinegar (prepared prior to experiment by adding a few drops of food coloring to about 4-5 tablespoonfuls of vinegar) into the bottle.
Watch as the colored vinegar falls through the oil and mixes with the baking soda.
Things should start getting a little crazy, just like a real lava lamp!
When the bubbling stops, add another few drops of vinegar and enjoy the show!


What's happening?

Vinegar and oil don't mix very well. The oil and vinegar you added to the bottle separate from each other, with oil on top because it has a lower density than water. The colored vinegar falls through the oil, mixes and reacts with the baking soda at the bottom, forming small bubbles of carbon dioxide gas that rise to the top and take some of the colored vinegar along for the ride. The gas escapes when it reaches the top and the colored water falls back down.
You may take things further by shining a torch at the bottom of the bottle in a dark room. Let the light shine through and watch!
Hope you enjoy it!