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We've a brand new science topic this half term, and as you might have guessed it links in with our whole rivers theme; changing states of matter.

What are 'states of matter'? There are three that we're going to look at (sorry plasma) - solid, liquid and gas. Each on has its own qualities that we'll look at, but to kick off we'll look at everybody's favourite liquid, water at room temperature.

You might know water at room temperature is a liquid - it flows, it changes shape to match its container but stays the same size.

But, did you know liquids can change into what we call gases - liquid water can change into water vapour. We call this process evaporation - it's a key word for our science this half term and we're going to do a little experiment to find out more about it.

Have a look at these extremely American children to find out more about evaporation:

How Does Water Evaporate? | PLUM LANDING on PBS KIDS

What happens to rain water when the sun comes out? Where does it go? Join sisters Kiana, Kaya and Kalea as they explore how water evaporates in both sun AND ...

We're going to be doing much the same thing. You'll need - water. I'd suggest measuring out no more than 20ml for each experiment, or you'll be there all day. Whatever measurement you choose, the amount of water needs to be the same.

 

Next, we're going to see how we can evaporate this amount of water quickly or slowly. You could take the 20ml of water and put it in a container that is wide. A container that is shallow. In a bag. Spread it out on the ground. Leave one in the sun. Leave one in the shadow. Pour one on paper. Mix salt in with one. Put one in the fridge. 

What other things do you think might effect how quickly the same amount of water will evaporate (dry up)? Don't forget - you need to use the same amount of water for each experiment location or it won't be a fair test. 

Good luck, take lots of photos and we'll see who can get their water to evaporate the fastest (and slowest)!

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