14+ simple science experiments for Valentines Day! Using a combination of chemistry and physics, our Valentines Day science activities are absolutely kid friendly. Great for preschool Valentine science! All you need are basic, inexpensive supplies for these quick to prep science experiments to try this Valentine’s Day!


Valentines Day Science Activities and Experiments for Kids


How awesome are these Valentines Day science experiments! You are going to find a treasure trove of simple science activities to set up this month with your kids. Plus, they all use inexpensive supplies.

Perfect Valentine’s Day science experiments for a limited budget and a limited amount of time! Even find a fun few science projects with candy hearts. Our Valentine science experiments include…

  • Fizzy eruptions
  • Homemade Slime
  • Lava lamps
  • Crystals
  • Oobleck
  • Bubbles
  • And so much more…

Easy Valentine’s Day science activities that you really can do with your kids. Simple science concepts for preschoolers to elementary ages 3-9. Of course, adults and older kids can still have lots of fun too! If you are getting ready to put together a fun Valentine’s Day science lesson, you will find everything you need right here.


Click on the links below to see how we set up each Valentine’s Day science experiment. Get a list of the supplies you need. You may even have what you already need to start a few this week.

ALSO CHECK OUT: Valentine’s Day Physics

Let’s get started with the science fun!

Crystal Hearts

Borax crystal hearts are easy to grow at home with just a couple of ingredients! You can grow crystals overnight with little effort. Plus they last a long time too! Also check out our salt crystal hearts.

How to grow crystals

Chocolate Candy Science

Chocolate candy science is a great way to talk about reversible change. What happens when you heat up chocolate? What happens when you heat up ice? Can it be reversed? What about when you heat up an egg or cook an apple? Can it be reversed?

Valentines Slime

Click on the link to find all our Valentine slime recipes. Several variations give you an opportunity to choose what you like or make all ! Each recipe will give you awesome slime quickly! Ready to play in 5 minutes! Bonus, free printable Valentine slime labels included.

A few of our favorites…

Water Displacement 

You can take simple experiments like this water displacement idea and give it an easy Valentine’s Day theme!

Oil and Water Science

Explore simple liquid density with this easy to set up Valentine’s Day oil and water science activity!

Valentine’s Bubble Science

Kids love bubbles and there’s some fun simple science to go along with this activity too. Bubble science isn’t just for summer!

Viscosity Valentine Science Experiment

Explore viscosity using a variety of common household liquids and a Valentine’s Day theme!

Heart Lava Lamp

A classic science experiment with a fun Valentine’s Day theme makes for a fun activity! Also check out our awesome Valentine’s Day erupting lava lamp.

Candy Hearts Oobleck

Heart oobleck or Red Hots Oobleck is a simple kitchen science experiment that explores Non-newtonian fluids. Is it a liquid or a solid? Adding the red hots or the conversation candy hearts gives it a fun twist and you can also check out how the candy dissolves which is science too!

Valentine Skittles

Try this take on a classic skittles science activity perfect for Valentine’s colored skittles!

Valentines Day Science with Skittles Candy Science

Cupid’s Magic Milk

Try this take on a classic magic milk science activity perfect for Valentine’s Day!

Dissolving Candy Hearts

Learn about solvents and solubility with a simple science experiment project with candy hearts!

Dissolving candy hearts for Valentines Day science

Science Valentine’s Cards 

Find a fun assortment for science theme Valentine’s Day cards along with this fun experiment card. Click here for all of the options we currently offer.

Additional Valentine’s Day STEM

Candy Science Sink the Hearts is a great STEM challenge with sink and float and math. How many conversation hearts does it take to sink the “boat”.

Exploring Flowers Through Science and Art {STEAM} allows kids to use flowers to paint or to paint the flowers! Take apart the flowers, examine the flowers, and learn about the parts of the flower all while creating with a unique art process.

Check out all our Valentine’s Day STEM Activities