This will keep them from moving around each other, but they will never stop moving all the way. When our smallest building blocks are cold, they get really close to each other. A physical change is kind of like the difference between sleeping, walking around, and have a CRAZY DANCE PARTY. When they get very hot, they will become so excited they will bounce off each other and into the air as a gas. When they get warmer, they will start to move around each other. If we look at all of the smallest parts that make an icicle, we can see them holding tightly together because they are not very warm. This kind of change can be as simple as crushing a can. Even though the water is changing, its smallest parts stay the same. A physical change happens when something changes the way it looks but does not change how it reacts with other things.
If you get that water hot enough it will begin to steam like your breath when it's cold outside. How is an icicle like a glass of water and how is that like your foggy breath on a cold day? You know that if an icicle gets warm enough it will turn into a puddle of water.
It takes a great deal more to change something completely. Just as you are the same person if you are sweating as you are when your teeth are chattering. Making something very hot or very cold will not change what it is. What is the difference between a glass of water and your foggy breath on a winter's day? What is the difference between an icicle dangling from a roof and the steam shooting out of a tea kettle? The answer? Not much.
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