observationdata analysismodelling
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Melting & Freezing
Hot? It melts. Cold? It freezes. Easy!
Melting and freezing are reversible physical changes driven by adding or removing heat energy.
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Big Idea
Energy is the key that unlocks changes between states of matter.
Melting
When something solid gets warm enough, it MELTS into a liquid. Ice melts into water. Chocolate melts in your hand. Wax melts on a candle. Every solid has its own special melting point — the exact temperature where it stops being able to hold its rigid shape and starts to flow. Ice melts at 0°C, but a metal like iron needs to be heated to a scorching 1538°C before it melts — that's hotter than lava!
Try it!
Slide the temperature. Watch water change!
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Freezing cold
Water is frozen into a SOLID — ice!
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