Free Science Experiments

Here is a huge assortment of fun and educational science experiments that you can perform at home.  Best of all, they are free and simple, and most only require basic household items.

  1. Balloon Hovercraft

    Balloon Hovercraft

    Balloon Hovercraft

    Make your own simple hovercraft out of an old CD and a balloon. Then watch it glide over the floor on a cushion of air. Make a few and have some races with friends which design outperforms them all?

    Suitable for kids aged 5+ with parental supervision

    You Need:
    • Balloon
    • Old CD (youre not listening too anymore)
    • Strong craft glue or super glue
    • Pop-top lid from a drink bottle
    What to do:
    1. Ensuring that the pop-top lid is closed, glue the bottom of the lid to the centre of the CD. The base of the lid needs to be completely covering the hole in the centre of the
    Read more »
  2. Hairdryer Hover Ball

    Hairdryer Hover Ball

    Hairdryer Hover Ball

    Hairdryers are not only good for drying hair. Impress your friends and float a ping pong ball in mid-air for minutes.

    Suitable for kids aged 7+ with parental supervision

    CAUTIONThis science activity should only be done under adult supervision as it requires the use of an electrical hairdryer. Ensure the hairdryer is always on its coolest setting.
    You Need:
    • Hairdryer
    • Ping pong ball
    • Toilet roll, or cardboard tube (optional)
    • Pencil (optional)
    What to do:
    1. Plug the hairdryer in at the wall, and put it on its coolest setting.
    2. Place the ping
    Read more »
  3. Floating Paper Clip

    Floating Paper Clip

    Floating Paper Clip

    Paper clips sink in water, right!? Using a piece of paper towel and a steady you can get them to float. Its all about the surface tension of the water. Try adding a drop of liquid detergent to upset the balance. Or floating the paper clips in different liquids. Lots of fun!

    Suitable for kids aged 5+
    You Need:
    • Container or bowl of water
    • Paper towel
    • Paper clips
    What to do:
    1. Drop a paper clip in the water, and watch it sink to the bottom. Why does it sink?
    2. Tear off a piece of paper towel about half the size of a dollar note (size doesnt matter, as long as its bigger than the paper clip).
    3. Place the piece of paper towel gently on to the water so it floats.
    4. Carefully place a paper clip on
    Read more »
  4. Egg In A Bottle

    Egg In A Bottle

    Egg In A Bottle

    This classic science demonstration never ceases to amaze. Get a hard-boiled egg through a small bottle neck opening and into the bottle without touching it. A great way to learn about air pressure.

    Suitable for kids aged 10+ with parental supervision

    CAUTIONThis experiment requires the use of matches and a small flame. Please exercise caution, and only perform under adult supervision.
    You Need:
    • A hard-boiled egg with the shell removed
    • A glass bottle with a mouth slightly smaller than the egg (fruit-drink bottles work well)
    • Small piece of newspaper about 10cm square
    • Matches
    What to do:
    Read more »
  5. Straw Rocket

    Straw Rocket

    Make this rocket quickly and easily out of drinking straws. Then blast it high into the air using air pressure. Fun and completely safe!

    Suitable for kids aged 5+ with parental supervision.

    You Need:
    • A drinking straw (preferably one that bends near the end)
    • Half a wider drinking straw (with a large enough diameter to slide easily over the other straw) Note: you can always make one of these out of paper
    • Masking tape
    What to do:
    1. Pinch one end of the wide half-straw and stick a piece of masking tape over it, to seal the end closed. This is your straw rocket.
    2. Slide your rocket straw over the straight end of the
    Read more »
  6. Cartesian Diver

    Cartesian Diver

    Make an age-old toy: The Cartesian Diver. It floats in a bottle filled with water, but when you squeeze the bottle, the diver mysteriously plunges to the bottom.

    Suitable for kids aged 5+ with parental supervision.

    You Need:
    • An empty soft drink bottle with cap (any size, your diver will dive further in a bigger bottle)
    • A third of a straw
    • Paper clip
    • Small chunk of modelling clay
    • Glass or cup to test your diver in
    • Water
    What to do:
    1. Fill the bottle with water.
    Read more »
  7. Balancing Act

    Balancing Act

    Balancing Act Science Magic

    Do the impossible balance a can on its bottom rim and amaze your friends

    Suitable for kids aged 6+

    You Need:
    • Two empty 375ml cans
    • 100mls of water approx
    What to do:
    1. Pour about 100mls of water secretly into one can.
    2. Have someone try to balance the other empty can on its bottom rim (see picture). It is impossible.
    3. Then amaze them, by easily balancing your magic can on its bottom rim (they dont need to know it has water in it).

    Why is it so?

    This science trick is
    Read more »
  8. Tea Bag Rocket

    Tea Bag Rocket

    An easy and fun way to learn about convection currents!

    Suitable for kids aged 7+

    You Need:
    • Teabag with a string and label
    • Non-flammable plate
    • Scissors Lighter or match
    • Lighter or match

    What to do:
    Remember - always ask an adult for help with matches and don't do this experiment near any flammable materials.
    1. Remove the staple, label and string from the teabag.
    2. Pour the tea into a bin.
    3. Unfold the teabag.
    4. Turn the teabag into a cylinder - make
    Read more »
  9. Spinning Earth

    Spinning Earth

    Spinning Earth And Ocean Marble

    Can you keep your ocean-marble on the spinning cardboard-earth for three whole rotations!? A fun way to model the spinning earth and learn about how spin effects weather.

    Suitable for kids aged 6+ with parental supervision.

    Young children will need an adult to help make the model earth, it requires cutting thick cardboard and measuring. No assistance should be needed for the actual spinning of the cardboard earth.

    You Need:
    • Large piece of thick cardboard
    • Push pin
    • String
    • Blutak
    • Scissors
    • Pencil
    • 60cm ruler
    • Foil
    • Marble
    What to
    Read more »
  10. Model Tsunami

    Model Tsunami

    Cause a tsunami by erupting a canister full of bubbling gas underwater

    Suitable for kids aged 10+ with parental supervision

    CAUTIONThe canister lid comes off with a lot of force, stand back and be careful to stay right out of its way.
    You Need:
    • Empty film canister with tight fitting lid or something similar
    • Plasticine
    • Alka-Seltzer tablet (available from the supermarket)
    • Tub or bucket (preferably transparent)
    • Water
    What to do:
    1. Mould enough plasticine around the bottom of the film canister to give it the appearance of a volcano and enough weight to keep it down in the tub of water.
    2. Fill
    Read more »