Hey there, looking sharp.
You're going to show us how to change the state of a substance by heating or cooling it, with the aid of these temperature controlled rooms.
When solids are heated they can melt into liquids. And when we freeze a liquid it becomes a solid.
Hadn't you better check on them?
Right. After being heated, the ice has melted into water.
For water this melting point is zero degrees celsius.
And it looks like you've done a fair bit of melting yourself.
When we freeze water it becomes ice.
It's changed from a liquid into a solid.
This happens when the temperature drops below zero degrees celsius.
Someone here's become a big icy too.
But of course, freezing and melting are totally reversible processes.
So! Who wants another go?
What happens when you heat or cool something down? Learn about melting and freezing with this video, and test what you've learned with the activity below.
Learn about evaporation and condensation with this video, and test what you've learned with the activity below.
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