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    Home » Primary Science » Key Stage 1 Science » Valentine’s Day Science Activities for Kids

    Valentine’s Day Science Activities for Kids

    February 10, 2022 By Emma Vanstone 35 Comments

    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 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

    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.

    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!

    Fizzy potions made with baking soda, vinegar and red cabbage indicator. The potions are in glass containers and red, purple and pink coloured.

    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.

    Pink balloon with a heart drawn on it on top of a small glass container containing alka seltzer and water for a Valentine's Day science experiment
    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!

    A white flower with blue tips on the petals after being left in a mixture of food colouring and water

    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.

    Pizza dough in a silver bowl for a respiration activity.
    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?

    Child running in a field for a heart rate science experiment
    Heart rate investigation

    Where is the heart?

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

    Child lying on a long sheet of paper to be drawn around for learning about different parts of the body

    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?

    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!

    Collage of easy Valentine's Day science experiments and investigations for kids.
    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!

    Collection of ideas for Valentine's Day science for kids

    Last Updated on February 10, 2022 by Emma Vanstone

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    Safety Notice

    Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

    These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

    Reader Interactions

    Comments

    1. Mum of One

      January 16, 2014 at 9:16 am

      What a great selection. I HAVE to try the transpiration one, that is amazing! Am pinning 🙂

      Reply
    2. Hellie's Corner

      January 16, 2014 at 9:19 am

      I’m with you on the not doing valentines day! Great idea though, to turn it around to learning about the heart.

      Reply
    3. Abby Boid

      January 16, 2014 at 9:29 am

      I absolutely love your site. It is one of my most favourite of finds in a while. When I get on top of Facebook and google+ I look forward to following you there. In the meantime, see you here again soon.

      Reply
    4. Amanda

      January 16, 2014 at 9:34 am

      Oh wow, these are great!! I shall be showing these to my husband tonight to see if we can do any of them with our toddler 🙂

      Reply
    5. Emma (My Little 3 and Me)

      January 16, 2014 at 11:03 am

      As ever Emma your ideas are just super. Lots to keep us busy on the build up to Valentine’s Day, thank you.

      Reply
    6. Mummy of Two

      January 16, 2014 at 11:04 am

      Some great ideas. We don’t usually do much for valentines either but would be nice to try a few of these with my eldest.

      Reply
    7. natalie

      January 16, 2014 at 11:18 am

      Some lovely ideas. Not that we usually do anything, although I love how you’ve involved the kids.

      Reply
    8. Laura @ Kneadwhine

      January 16, 2014 at 11:20 am

      These are brilliant ideas – I’d forgotten about the flower/food dye experiment. Must do that with D!

      I’m glad to have found you – sure I’ll be doing some pinning!

      Reply
    9. Michelle

      January 16, 2014 at 11:45 am

      Some very cute ideas!

      Reply
    10. Sim @ Sims Life

      January 16, 2014 at 12:23 pm

      Aww some fab ideas and I will definitely be trying these out with mini me!! I absolutely hate Valentine’s Day 🙁 x

      Reply
    11. Ali at kidschaos.com

      January 16, 2014 at 12:53 pm

      some darling ideas there Emma, we’re looking forward to reading more about the baking soda heart!

      Reply
    12. Donna @ Little Lilypad Co

      January 16, 2014 at 12:56 pm

      For someone that doesn’t really do Valentines, you have some “love”ly ideas 🙂

      Reply
    13. Mammasaurus

      January 16, 2014 at 1:04 pm

      oooo one with flowers! Kitty would love that – off to look!

      Reply
    14. maggy, red ted art

      January 16, 2014 at 1:29 pm

      Wow! So many great ideas! Love them!

      Reply
    15. Boo Roo and Tigger Too

      January 16, 2014 at 1:31 pm

      The coloured flowers is amazing *wonders if Mr Boo will treat me to flowers any time soon*

      Reply
    16. Alice

      January 16, 2014 at 1:35 pm

      I’m bookmarking these… we are a big fan of hearts in this household and my little one will love so many of these activities!

      Reply
    17. Fritha Strickland

      January 16, 2014 at 1:44 pm

      I love the transpiration idea! so pretty! x

      Reply
    18. Lori

      January 16, 2014 at 1:47 pm

      I always love a bit of science 🙂 but I’m a total hearts and flowers type of girl when it comes to Valentines Day. I think we might try the flowers and glittery heart combo for the 14th 🙂 Thanks for sharing x

      Reply
    19. Hannah Staveley

      January 16, 2014 at 2:00 pm

      That’s is so good I just love this .x

      Reply
    20. Laura Halls

      January 16, 2014 at 3:57 pm

      What a fantastic alternative

      Reply
    21. Jennifer

      January 16, 2014 at 4:25 pm

      What great ideas! That pizza looks so yummy 🙂

      Reply
    22. Aisha from expatlog

      January 16, 2014 at 4:54 pm

      Some great ideas – I want to try the transpiration one too 🙂

      Reply
    23. Charly Dove

      January 16, 2014 at 6:42 pm

      Gosh so many brilliant ideas! Our toddler would love to do most of these 🙂

      Reply
    24. Vicky

      January 16, 2014 at 6:44 pm

      What fun ideas! I’m not really a hearts and flowers idea, but I love finding new themed crafts and activities to do with the kids, so I know we will be making heart shaped pizza! Mmmm….mmmm!

      Reply
    25. Twinsplustwo

      January 16, 2014 at 8:34 pm

      Some really good ideas. I wish I could have benefitted from your Blog when my children were younger, will share it with my HE friends too.

      Reply
    26. Cass (@frugalfamily)

      January 16, 2014 at 8:40 pm

      I love your ideas – they’re fab x x

      Reply
    27. Kirsty

      January 16, 2014 at 9:19 pm

      What a great round-up! Pinned for later and shared 🙂

      Reply
    28. Louisa

      January 17, 2014 at 1:37 pm

      I really must try changing the colours of flowers (for my own entertainment, not the kids)!

      Reply
    29. Corinne Jacob

      February 18, 2014 at 7:10 am

      Awww man, I wish I had found this earlier! It’s not too late to have a post Valentine’s weekend. Is it? 😀

      Reply
    30. Willie

      March 08, 2017 at 5:32 pm

      Yeah, that’s the tiektc, sir or ma’am

      Reply
    31. Liza

      March 08, 2017 at 9:07 pm

      Fif > &la&no; Iguorantqnbsp;» tout seul dans un message, ce n’est pas très utile non plus et cela, n’apporte rien au débat

      Reply

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