Here is yet another simple activity that doesn’t require many items.
(Source: Easy Peasy All in One Homeschool)
Gather three glasses you can see through. Fill one with hot water, one with cold water and one with salt water. Put a few drops of food coloring into each glass. Make observations. Which is the densest? Which is the least dense? How are density and viscosity related?
Here are a few home videos to explain. Enjoy and God bless!