5 Lego based science experiments

Did you know that Lego is a great tool for helping children develop fine motor control, logic skills and for learning to read and understand instructions? You can also do lots of different science experiments which are fun, easy and educational. Check out this post for more information on how to keep kids entertained and engaged.

Here are 5 top Science lego based experiments that will keep kids of all ages entertained for hours.

1. Design an Animal Model: Animal Studies

Picture 7This experiment engages students in explorations about the physical and behavioral characteristics of the major groups of animals (fish, amphibians, reptiles, mammals, crustaceans, insects, birds), which culminates with students designing and building a fictional animal that displays physical and behavioral characteristics adaptable to a rainforest ecosystem just by using Lego bricks. The Lego can be used to explain how an animal model works and will allow children to design and explain what they think different habits for different groups of animals look like.

2. An Ice Excavation Experiment

Help the Lego man escape from the freezing ice in this exciting experiment! All you will need is a plastic cup, water and ice. You will need to add water to the cup- about 3/4 full, add the Lego man and leave it to freeze in the freezer over night. You could set your kids a mission to find the unusual fossil and help the Lego man escape. Provide them with salt, extra water and tooth picks so that they can explore the hidden treasures inside. Let them explore and experiment with the salt you could even try adding food colouring to create a fun effect.

3. Density Experiment- Float or sink?

This is a really cool demonstration to explain the concept of density. All you will need is vegetable oil, water small pieces of Lego and small objects. First of all you will need to pour some water carefully into a glass or jar. Then, very carefully add about the same volume of cooking oil on top. You will then need to drop a couple of small objects into the mixture and observe what happens. Can you find something to float on each layer? What happens if you shake it?

Each of the liquids have a different mass of molecules or different numbers of parts squashed into the same volume of liquid, this makes them have different densities and therefore one can sit on top of the other – the more dense a liquid is the heavier it is.

Objects and liquids float on liquids of a higher density and sink through liquids of lower density. The Lego brick  sinks through the oil but floats on the water, while the coin sinks through both. The coin is therefore more dense than both the oil and the water.

Density experiment

Density experiment


4. Hidden Lego men

Teach kids about what happens to paper when it gets wet by carrying out this fun experiment involving Lego men! All you will need is different coloured paper, Lego men (or small toys) and some water.You will also need paper with different thicknesses as you can then ask your children which paper they think will absorb the water the quickest and why.

First of all you will need to fold each corner of the paper into a triangle so that it meets in the middle (see image below). Then add the Lego man to the middle of the paper which will then need to be placed onto the water. The Lego man will be revealed as the paper gets wet.

The reason that this happens is because paper is made of lots of fibres, as they absorb the water they swell and the paper expands, which made the triangles open up. Different types of paper absorb water at different speeds. Thinner paper absorbs more quickly, as it has thinner fibres.



Folded triangles- hidden Lego men!

Folded triangles- hidden Lego men!

5. Lego slime!

Who doesn’t love slime! Its messy, fun and more importantly can keep kids entertained for hours. For this experiment you will need clear glue and liquid starch. It is essential to add one tablespoon of liquid starch at a time then stir well to create the perfect slime. Once the ingredients start to stick together you will need to start kneading the slime so that it is easy for kids to play with. The fun part- you will need lots of odd Lego parts and heads of Lego men. You could get your kids to mix the Lego with the slime to create a fun colourful texture.

Did you know you can mold slime? Put it in the refrigerator and out pops any shape you want. We did this when we wanted to excavate the LEGO out of the slime!



Lego slime!