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Freezing

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Teacher/Instructor Matt Jones
Matt Jones

M.Ed., George Washington University
Dept. chair at a high school

Matt is currently the department chair at a high school in San Francisco. In his spare time, Matt enjoys spending time outdoors with his wife and two kids.

Freezing is the transition of a substance from the liquid to solid state of matter. Most substances are more dense in their solid form, with the exception of water which expands as it freezes. The opposite of freezing is melting.

Freezing, freezing is another phase change which is change from one state of matter to another and in this case the change is from a liquid into a solid. So let's talk about the energy, energy of liquids remember liquids have a lot of motion and a bit of entropy and solids have less entropy and very little motion. In fact they just have a little bit of rotational motion around a fixed point. So what we're doing we're going from something with more energy in motion to something with less. So what are some things that can change the freezing point, that the level at which we take enough energy out of a substance to cause it to freeze.

But one thing you can do and we do this a lot on the road, is we can use some kind of salts or some, mixed something with our liquids. So if we add salts to water what we're doing is we're putting all of these ions in there positively and negatively charged ions amongst our water and we're preventing it from forming these bonds that need to become a solid. So putting salt or any freeze into a liquid like water will actually lower its freezing point. We can also adjust the freezing point by pressure so if we apply pressure onto a substance, that will also adjust its freezing point or if we raise the pressure. Freezing point depend on if there's less pressure there's going to be more in movement and if there's more pressure we're going to strict the movement and we're going to cause a freezing.