Have you ever tried making a Rainbow in a Jar project? If you haven’t tried this classic density experiment, I’m going to show you how easy it is to make with a few common household items! This rainbow science experiment is so pretty and will amaze your preschool, pre-k, kindergarten, first grade, 2nd grade, 3rd grade, 4th grade, 5th grade, and 6th grade students. Try this rainbow experiment as part of a weather theme, St Patricks Day activity, a rainbow theme or a spring activity for kids.
Rainbow in a Jar
Get ready for a WOW spring science experiment for kids of all ages! This Rainbow in a jar experiment is a great way to teach density for kids in a meaningful and memorable way! Use this rainbow activities for preschoolers, toddler, kindergartners, grade 1, grade 2, grade 3, grade 4, grade 5, and grade 6 students. Just grab a couple simple kitchen items, a jar, and get ready to create a BEAUTIFUL rainbow in a bottle! This density rainbow is a fun spring science.
Before we dive into this must try science experiment for kids, you need to understand what density is. Basically density i s how tigh the molecules are in a substance. If you dive into a ball pit with just a few balls you will sink down because you are more dense than the items in the ball pit. But, if the ball pit is jammed pack full, you may only go part way or lay across the top. The balls are more densly packed than you are. In this density experiment for kids we will visually see how some items like corn syrup and honey are more dense, think about how S-L-O-W-L-Y they flow, than say water. Ready to try?
To make this stunningly beautiful rainbow science all you need is a few common materials you probably already have on hand:
- clear jar
- red, blue, green liquid food coloring
- blue dish soap
- extra virgin olive oil (looks yellow)
- rubbing alcohol
Rainbow in a Jar Experiment
Start off my mixing in a container about 1/3 cup honey, one drop of red food coloring, and one drop of blue food coloring. Stir to make a purple color liquid. Now carefully pour the most dense liquid into a clear glass or plastic container. Take care not to get it on the side of the container as it will not look as cool
Rainbow in a Bottle
Add in a good layer of blue dish soap. Again, the trick is to pour it VERY slowly to not mix up the food coloring at the bottom or it will mess up the colors. You can also use a pippette or turkey baster to slowly put the liquid exactly where you want it so it doesn’t run down the side of the jar.
In a seperate container mix water and green food coloring. Carefully add the green liquid to your density jar. If you don’t have a pipette, tip the jar so the liquid runs down the side of the jar VERY slowly.
Rainbow Science Experiment
Wait a few minutes to make sure your layers are settled and then add a layer of olive oil. Again, be very careful when pouring in the liquid so the colors don’t mix. Although the liquids would settle to the same spot, the food coloring would all mix together and make brown – not so pretty.
Finally mix rubbing alcohol with red food coloring in a small container. Now carefully pour the red liquid into the density jar. Again go slowly or the food coloring will mix together and you wont get a pretty rainbow. The rubbing alcohol is the least dense liquid in your density in a jar experiment.
Isn’t this spring science project so fun! I love seeing the kids faces when they watch it all come together and the concept of density clicks! Plus you’ll love that this St patricks day science experient is so easy and uses common items you have around your home already!
Solid liquid Gas examples for kids
Explore states of matter further with these fun projects:
- Cookie Jar Solid Liquid Gas Worksheet – States of Matter Activity
- Pop Rock States of Matter Experiment (liquid to gas)
- Making Homemade Butter – a states of matter experiment (liquid to solid)
- How to Make Ice Cream in a Bag State of Matter Experiment (liquid to solid)
- 2 Fun, Hands-on Water Cycle Activities – State of Matter Experiment for Kids (liquid to gas)
- Explore density further with this Rainbow in a Jar Density Experiment
- Solid Liquid Gas for Kids with Hands-on Density Experiment
- Water Balloon Density Experiment for Kids
- Bowl of Ice Cream left out (solid to liquid)
Free St Patrick’s Day Printables
Looking for more fun, free saint patricks day printable ideas and activities for March? You will love these free resources for toddler, preschool, and kindergarten age students.:
- Hands-ton St Patrick’s Day Counting Activity with free printable
- St patrick’s day for preschoolers Cute activity pages
- Work on pre-writing skills with these cute, Free St Patrick’s Day Printables Tracing Strips
- Color by Letter St Patricks Day Worksheets
- Leprechaun Hat Letter Tracing St Patrick’s Day Printables
- Rainbow Alphabet Matching St Patrick’s Day Activities
- Use Fruit Loop cereal to make a rainbow with these St Patrick’s day Printables
- Count and Trace with this fun and free St patrick’s day preschool activities
- St Patrick’s Day Color by Number Worksheets to work on number recognition while revealing cute hidden mystery pictures
- Find the Letter St Patricks Day Worksheets
- Count to 20 Puzzles for March
- Printable Scavenger Hunts, St. Patrick’s Day History Worksheets, and St. Patrick’s Day Alphabet Match
- Counting to 20 Puzzles are a fun St Patrick’s Day Preschool Activities
- St Patricks Day for Kindergarten counting with ten frames
- Pot of Gold St Patrick Day Activities – working on sorting beginning letter sounds coins by the correct pot of gold letter
- St Patricks Day Math Craft
- St Patrick’s Day Color by Number Hundreds Chart
- Addition St Patrick’s Day Worksheets – add and dab the lucky clover with a cute Leprechaun
- Work on Addition within 20 with this Craft kids will make from St Patricks Day Math Worksheets
- Free st patrick day printables Addition BINGO makes practicing math FUN – print in color or black and white!
- Pot of Gold Addition Game
Rainbow Activities for Kids
Looking for more fun rainbow activity ideas? Check these out!
- How to Grow Rainbow Crystals EASILY at Home – Spring Science Activity
- Beautiful Rainbow Slime Activity for Kids
- Rainbow in a Jar Density Experiments
- Simply Rainbow Density Experiment for springtime
- Delicious Rainbow Stem scienc with jelly beans
- Rainbow Handprint Craft
- Easy Tissue Paper Rainbow Craft for Spring
- Rainbow Toast makes a yummy snack!
- Super cute Rainbow Math with a DIY abacus activity
- Rainbow Painting with Cars Activity
- Free printable Rainbow Color Matching Game
- Craft Stick Rainbow Craft
- Rainbow Rhyming Activity for Kindergarten
- Rainbow Worksheets for kids
- Free Connect the Dot Rainbow Printable for Preschoolers
- Hands-on Rainbow Math Activities for Preschoolers
- Rainbow Playdough Shape Mat
- Lots of fun ideas in this Rainbow Preschool Theme
St patrick’s day printables
For elementary age students, check out these fun, hands-on printable activities for St Patricks Day.
- Learn about Ireland for Kids with these free printable books or these Ireland Coloring Pages to read, color, and learn!
- Pot of Gold Math St Patricks Day Activity
- Rainbow Read, Rhyme and Dab St Patricks Day Activity
- Work on early literacy skills with this Rhyming Rainbows St Patricks Day for Kindergarten
- Create-a-Word Spelling St Patricks Day Worksheets
- Work on reading comprehension with these St Patricks Day Worksheets
- Fun, Free Printable Place Value Games for St Patrick’s Day
- Practice Factors with this FREE Printable Lucky Leprechaun Games
- St. Patrick’s Day Math Equation Mats are a fun hands-on math activity for elementary age students to work on addition, subtractions, multiplication and Division this spring!
- Practice sorting by syllables with these Free St Patrick’s Day Printables
- St Patricks Day Addition Math Crafts for 1st Grade
- I Spy St Patricks Day Printables
- St Patricks Coloring Pages
- Printable St Patrick’s Day Scavenger Hunt
- St. Patrick’s Day Printables Write The Room
- Clover Letter Find St Patrick’s Day Worksheets
- Clover Pattern Strips – FREE St Patrick’s Day Printables for Preschool
- Free Printable March Writing Prompts or these calendar march writing prompts
St Patrick’s Day Activities
Looking for some cute St patricks day crafts or clever st patricks day activities, don’t miss these fun ideas:
- Super FUN Leprechaun Rocks Science Experiment
- Mr Lucky Shamrock Craft for St Patricks Day
- Pot of Gold Craft with fun name recognition activity
- St Patrick’s Day Color by Numbers Printable Hat
- Rainbow Handprint St Patrick’s Day Craft for Kids
- 30+ Creative St Patrick’s Day Craft for Kids
- Over 40 EPIC St Patricks Day Activities
- Pot of Gold Glitter Slime – St Patricks Day Activity
- Shamrock Craft – St Patricks Day Art Project for Kids with black glue
- 7 Cute Handprint St Patrick’s Day Crafts for Preschoolers
- Color Hunt St Patricks Day Ideas for Toddlers
- Lucky Clover St Patrick’s Day Crafts for Toddlers
- Stamping Clovers St Patricks Day Shamrock Craft
- Rainbow Easy St Patrick’s Day Crafts
- Super Cute Hanging Rainbow St Patrick’s Day Crafts for Toddlers
- Whip up a batch of this lovely green contact solution slime
- Pick up some new favorite St patricks day books for kids
Or take a peak at this weeks worth of activities in our St Patrick’s Theme , this St Patrick’s Day theme Preschool, or all our ideas to celebrate with st patrick’s day activities for kids of all ages!
Food science experiments for kids
Use items commonly in your kitchen to try these food experiments for kids, but note they are NOT all edible!
- Plastic Milk Experiment with free worksheet
- Exploding Watermelon EPIC project to learn about potential energy
- Kids will be so impressed with this super cool Lemon Volcano
- Kool Aid Rock Candy science experiment you can EAT!
- Learn about the 5 sense for kids with lots of projects including an edible skin model
- This colorful oil and water experiment is super simple, but so FUN
- Volcano Watermelon Experiment – Summer Activity for Preschoolers
- Use jelly beans for this hands-on STEM Easter activity for kids
- Learn how to make frost in a can
- Discover the Archimedes bath tub concept using candy with this simple water displacement experiment
- Try the classic bouncy egg experiment with a twist
- Learn about types of rocks with edible rocks
- Learn about density with this Rainbow in a Jar
- Use chemistry to inflate these balloons with with Pop Rocks Experiment
- This silly dancing raisins experiment always makes kids giggle!
- Kids will love this jelly bean taste test experiment
- Use celery for a hands-on pollution experiment for kids
- This Egg Drop Project STEAM activity is all about protecting the egg
- Magic Milk 4th of July Science
- Make an edible Jello Cell Model
- Use eggs to try these air pressure experiments for kids
- You can’t eat them, but these magic melting snowballs experiment is loads of fun!
- Make your own Peep Experiment
- Try making butter science experiment for science you can EAT
- Whip up a fizzy lemonade science experiment for another fun science project you can taste
- You’ve got to try this pretty, colorful candy skittles experiments
- Or check out over 100 Food Science Experiments