Colored Convection Currents Science Experiment

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We are recently tried out a fun and simple experiment called colored convection currents. Have you heard of a convection current before?

Learn all about it here today! Then go and teach it to someone else. 🙂

What Are Convection Currents?

Convection is the movement within a liquid (or air) when the hotter and less dense liquid rises, and the colder, denser liquid sinks due to gravity. These movements create the circulation patterns in our atmosphere through air and water. The warm water or air rises and allows cooler air (or water) to go underneath.

This results in a transfer of heat. Heat can be transferred by convection when there is a big difference in temperature between the two different liquids.

The same thing happens in the movement of air. If you have ever watched the weather channel you can hear them talking about cool air and warm air moving across the earth. I am sure you also have heard that hot air rises? Well you can watch that happen in this experiment.

How to Do the Convection Current Experiment

If you take two bottles of water colored with food coloring, one with cold water and one with very warm water, you can create a current that is really fun to watch! The current will look completely different depending on whether the warm is on top or the cold is on top.

We tried both convection currents at the same time with four different bottles.   I made the cold water blue and the warm water red- so you could see the heat rising and mixing. Place a notecard or playing card on top of the bottle that you are going to flip over to hold in the water. There may be a few drops of spilled water, so be prepared for that!

To see both currents at once, leave warm on the bottom for one and cold on the bottom for the other. Once the bottles are on top, pull out the card and you will see the water with the warm on the bottom quickly rise and mix into the cold water. For the one with the cold water on the bottom, it barely mixes!

Try this convection current experiment sometime . It is SO fun & easy. Experiment with different colors, too!

Try More Fun Science Experiments:

The Science of Air

States of Matter: Solids, Liquids and Gasses

Density Experiment