Get smart curated videos delivered to your inbox.   SUBSCRIBE
The Kid Should See This

Hot & Cold Water Science Experiment – HooplaKidzLab

Watch more with these video collections:

With two matching jars, red and blue food coloring, some hot and cold water, an index card, and a dish or baking pan, you can observe how the different densities of hot and cold water behave. This experiment by HooplaKidzLab demonstrates how the more dense cold water sinks — those molecules are closer together — pushing the slightly less dense hot water to float on top.

Air behaves in the same way… think of hot air balloons as an example, or a multi-story house on a hot day, where the top floors are warmer than the bottom floors or basement.

Watch the experiment again in this easy DIY six second science demo:

Related reading: Heat transfer and efficiency.

Related video experiment: How to make a hot air balloon.

Thanks, @alba.

This Webby award-winning video collection exists to help teachers, librarians, and families spark kid wonder and curiosity. TKSST features smarter, more meaningful content than what's usually served up by YouTube's algorithms, and amplifies the creators who make that content.

Curated, kid-friendly, independently-published. Support this mission by becoming a sustaining member today.