STEAMInsights: DIY Rainbow Density Jar

A colorful way to explore science at home.

Creating a Rainbow Density Jar is a magical, hands-on activity that teaches children an essential science concept—liquid density—all while creating a beautiful layered display. This simple STEAM project is perfect for parents looking to spark curiosity and support learning at home.

⭐ What Is a Density Jar?

A density jar is a clear container filled with liquids of different densities. Because each liquid has a different weight (mass per unit volume), they naturally form layers without mixing. Kids get to experiment, observe, and ask questions—just like real scientists!

🌈 Materials You'll Need:

To create your own rainbow jar, you will need:

• 1/4 cup honey

• 1/4 cup light corn syrup (add 3–4 drops of blue food coloring before pouring)

• 1/4 cup dish soap (green works best)

• 1/4 cup water (mix with 3–4 drops of red food coloring)

• 1/4 cup vegetable oil

• 1/4 cup rubbing alcohol (mix with 3–4 drops of purple food coloring)

  
  

You will also need:

• A tall, clear jar or vase

• A spoon

• Food coloring (optional but fun!)

• A steady pouring hand or pipette

  
  

✨ Step-by-Step Instructions

1. Start with Honey

Pour 1/4 cup of honey into the jar.This is your densest liquid, so it belongs on the bottom.

2. Add Colored Corn Syrup

Gently pour 1/4 cup of blue corn syrup down the inside wall of the jar or use a funnel.Pouring slowly prevents mixing.

3. Pour in the Dish Soap

Add 1/4 cup of green dish soap directly into the center of the jar.

4. Add Colored Water

Mix water and red food coloring, then pour slowly down the side of the jar.

5. Pour Vegetable Oil

Add 1/4 cup vegetable oil.You’ll notice it sits nicely on top since oil is lighter than water.

6. Finish With Colored Rubbing Alcohol

Carefully pour 1/4 cup purple alcohol using a pipette or pour slowly onto the back of a spoon.This helps prevent the alcohol from mixing with the oil.

🎉 Science Behind the Rainbow

Each liquid has a different density, so heavier liquids sink to the bottom while lighter liquids float to the top.

Use the keyword anchor text “density for kids” when helping your child understand that density means how tightly packed the molecules are.

🌊 STEAM Spotlight: About Marine Engineering

Have you ever wondered how massive ships float, how submarines rise and sink, or how underwater robots explore the ocean? These are all challenges solved by marine engineers.

What Marine Engineers Do

Marine engineers design and build:

• Ships and boats

• Submarines

• Offshore structures (like oil rigs)

• Underwater exploration equipment

• Renewable ocean energy systems

  
  

How Density Connects to Marine Engineering

Understanding density is critical in marine engineering!Engineers must calculate the density of:

• Water (saltwater vs. freshwater)

• Ship materials

• Cargo weight

• Air tanks inside submarines

  
  

These calculations help ensure structures can:

• Float safely

• Submerge when needed

• Resist pressure in deep water

• Stay stable during waves and storms

  
  

By making a Rainbow Density Jar, your child is using the same scientific thinking real marine engineers apply every day!

🎨 Extend the Learning

Here are some questions you can ask your child:

• What happens if you shake the jar?

• Which layer is the heaviest? Why?

• Can you predict what will happen if we change the order of pouring?

You can even challenge them to test other liquids: maple syrup, milk, soda, etc.

🚀 Ready to Spark More STEAM Learning?

If you enjoyed this activity, join us for more hands-on STEAM fun through The STEAM Generation’s classes, camps, and workshops!

👉 Visit our website or enroll your child today to keep the learning adventure going!

For more engaging STEAM activities and programs, check out https://steamgeneration.org/steam-programs

Remember, learning is an adventure, and with a dash of creativity, it's also a whole lot of fun!