I have to admit, we don’t really do Valentine’s Day in our house. I’m not really a hearts and flowers kind of girl, but the kids are quite curious and excitable this year, so I’ve put together a small collection of fun and easy science activities for Valentine’s Day.

Heart Patterns

First up are super simple heart patterns. Cut out different colour and size hearts and use them to make heart patterns. If you want to mix it up a bit more, add some flower shapes too!

Heart shapes are also great for practicing cutting and those ever important fine motor skills.

Blow up a heart 

How about blowing up a balloon with a heart drawn on or even a heart shaped balloon using the fizzy power of an effervescent tablet or baking soda and vinegar.

Blow up a balloon with alka seltzer - fun Valentine Science Activity
Blow up a balloon with alka seltzer

Coloured Valentine Flowers

Create pretty flowers for your Valentine with this super simple transpiration experiment. All you need to do is buy some white flowers and place them in a mixture of food colouring and water for a few hours. The petals will change colour as the coloured water travels up the stem into the petals!

Valentine science - colour flowers with food colouring and water #Transpirationexperiment

Respiration Pizza

Anyone for a heart shaped pizza? This is a great activity for learning about respiration as yeast is used to make the dough rise.

Valentine science - use yeast and pizza dough to demonstrate respiration
Respiration – pizza dough

How fast does your heart beat?

How about learning about heart rate and how it changes with exercise with this fun investigation?

Heart rate investigation - measure heart rate before and after exercise to discover how much it changes
Heart rate investigation

Where is the heart?

Can you draw around yourself and draw your heart in the right place?

Learn about the body - Science for Kids

Make your own stethoscope

Make a stethoscope and listen to your heart beating. Spiderman dress up is optional!

Children testing a homemade stethoscope - Science for Kids
Homemade stethoscope

Valentine Candy Science

You could make a beautiful coloured heart with skittles or M & Ms.

Skittles Experiment - Science for Kids

Or, how about building a tower of candy using Valentine sweets and toothpicks?

Secret Valentine Messages

Did you know you can write secret messages with lemon or lime juice?Amazon.com Widgets

Secret Messages - Science for Kids

We had a lot of fun making these scratch art canvas pictures too.

Scratch art message for Valentine's Day
Scratch Art Messages for Valentine’s Day

Once you’ve made your secret message, create a delivery system for it. This could be a paper plane, parachute, zip line or even a motorized car.

STEM Challenge for Valentine's Day - make a delivery system for a Valentine message

Do you have any more Valentine’s Day Science ideas for us?

Little Bins for Little Hands has some gorgeous crystal hearts to make and a beautiful heart lava lamp.

Red Ted Art has some brilliant Valentine’s Day resources for teachers and parents too!

Easy Valentine Science Activities for kids #scienceforkids #scienceexperimentsforkids #STEMforkids
Science Experiments for Valentine’s Day

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If you didn’t find what you were looking for here we’ve got lots more easy science experiments to try!

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Originally posted at Science Sparks