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Particles - we've come across this word before when we did sound. What are they? Well, they're tiny tiny tiny tiny tiny tiny little parts of matter - a physical substance (that means something that you could touch). 

What do they have to do with solids, liquids and gases, I hear you ask?

Well, particles make up all of them! But they behave very differently...

In a solid, they're all packed together very closely and linked very tightly - they don't move on their own.

In a liquid, the links between the particles are less strong and they can flow and move over each other, fitting a container.

In a gas, they just float about all over the place.


Have a look at this video to see how particles make up different states of matter (it's aimed at slightly older children, but is very good for what we're after).

Here's what I need you to do - we're going to do some scientific modelling. I want you to find something in your house that you can use to show particles - it could be lego bricks, cotton wool buds, balloons, even scrunched up balls of paper if you like. I want you to show me these particles as a solid, a liquid and a gas. How do they look different? How are they behaving? Take a picture of your 'particles' in these different states of matter!