science and Technology

Valentine’s Day Science Activities for Kids


I have to admit we don’t really do Valentine’s Day in our house, but I do love theming science experiments to a special occasion so here are some easy Valentine’s Day science experiments. Make a skittles heart, a paper aeroplane delivery system, colour-changing love potions and lots more!

Valentine’s Day Science Experiments

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Heart Patterns

First up are super simple heart patterns. Cut out different colours and sizes of 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 practising cutting and those ever important fine motor skills.

Make a fizzy love potion

These colour changing love potions are fantastic fun. The use of red cabbage indicator means the colour of the potion changes when an acid or alkali is added!

Blow up a heart 

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

The reaction between the effervescent vitamin tablet and water produces carbon dioxide gas which fills the jar and then the balloon, causing it to inflate.

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!

Respiration Pizza

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

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

Where is the heart?

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

Make your own stethoscope

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

Homemade stethoscope

Valentine Candy Science

Make a beautiful coloured heart with skittles or M&Ms. Simply create a pattern on a white plate or tray and pour warm water over the top.

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? Widgets

We had a lot of fun making these scratch art canvas pictures too. Oil pastels work really well for this activity.

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.

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!

Science Experiments for Valentine’s Day

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

Last Updated on February 6, 2023 by Emma VanstoneThe post Valentine’s Day Science Activities for Kids appeared first on Science Experiments for Kids.