I’ve lost count of the number of water science experiments we’ve done over the years. Water is pretty amazing. Did you know it is the only natural substance to exist in three physical states at temperatures naturally occurring on Earth?

Facts about Water

  • Water covers about 70% of the surface of the Earth.
  • Water expands when it freezes.
  • We need water to survive.
  • Water expands when it freezes.
  • Water can move upwards!!

Water has lots of properties that make it just brilliant for simple science investigations!

Water Science Experiments and Investigations

Freezing and Melting Investigations

Freezing and melting investigations are always fun. For younger children simply let them play with ice cubes while they melt. To make this a bit more exciting you can freeze small toys inside.

We had great fun with our LEGO ice excavations recently, but you could also freeze superheroes, bugs or anything else that might spark an extra interest.

LEGO Ice excavation - science for toddlers

Just getting the child to recognise that the ice is cold and how that feels on their fingers is a great sensory experience. Remember to let the ice melt a little first as ice can be sticky when first removed from a freezer.

Frozen juice ice cubes used to make a slushy drink. A great experiment for learning about freezing, melting and other properties of water. #waterscience

Water Cycle Experiments

Make a mini water cycle or a water cycle in a bag. These are great science activities for older children and really help explain a tricky concept.

Water Cycle Experiment

Water and Density

Density is a really tough concept to grasp, but hopefully this density science trick is interesting and simple enough to help it all make sense.

Coloured water and salt density trick - cool science trick for kids

Density jars are also great fun, children can try and find different small objects to float on the layers.

Density jar - fun density activity for kids. Float water on oil and find  a small object to float on each layer

Transport of Water in Plants

Learn about transpiration and make some pretty coloured flowers. I LOVE this activity. If it works well, you can see the path the water takes to get to the edge of the petals.

Transpiration experiment for kdis - make pretty coloured flowers - cool science for kids

Sinking and Floating Experimemts

How about some simple sinking and floating experiments? This is great for young children, who will just enjoy watching objects sink and float. Older children could make a plasticine boat and discover whether an item that previously sank can float in the boat.  Or try and predict which objects will sink a which will float.

Did you know you can use a bit of clever density science to make an egg float?

Children can also make a lemon sink if they understand why it floats in the first place!

make a lemon float

Oil and Water Experiments

Find out why oil and water don’t mix. We’ve also demonstrated this using coloured water and pipettes which was brilliant fun.

oil and water don't mix! Coloured water droplets suspended in water.

Osmosis Experiments

Learn about osmosis ( water passing through a semi permeable membrane ) using eggs. The term Osmosis might sound complicated, but this egg demonstration makes it more understandable, and don’t worry if your children don’t understand straight away or are too young. It’s still fun to watch the eggs expand and then shrink.

Using eggs to explain osmosis

Absorbing Water

How about exploring absorption using sugar cubes. The fact that you can watch the water rise up the cube is brilliant and appeals to children of all ages.

Absorbing water experiment using sugar cubes. Place the cubes in coloured water and watch as the cubes absorb it!

A walking water investigation is another great way to learn about how water is absorbed by different materials.

Water Powered Rocket

Learn about air pressure with this very cool water powered bottle rocket.

Water Powered Bottle Rocket - air pressure experiment for kids

Filtering Water

Discover how to clean water with this easy filtering activity using paper towels or using sand and stones.

Is it waterproof

Investigate which materials are waterproof by using them as a roof for a LEGO house and investigating whether they keep the floor dry.

lego house with sticks for a roof

Dissolving in Water

Predict and test which substances will dissolve in water?

Do you have any more water science experiment ideas for us?

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Easy Water Science Experiments and Activities for Kids. Freeze it, melt it, dissolve things in in. Discover the wonder of water with these easy water science experiments for kids #waterscience

More Science for Kids

Try our fun science tricks or easy Fairy Tale STEM challenges!

If you enjoyed these experiments don’t forget to check out the rest of our 100s of other science experiments for kids too!

Fun Science for Kids

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Originally posted at Science Sparks