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MacRoscopic Properties: The World We See

Phases of Matter and Intensive Properties

Why might a soft drink freeze when you open it?

Remember that the freezing point of a solution is decreased by having anything dissolved in it. When a soft drink is opened and CO2 rushes out, less CO2 is present in the solution, causing the freezing point of the solution to increase. So at a constant temperature, the increase in freezing point causes the soda to freeze. If you haven’t seen this happen, you can try to make it happen by placing a soda in the freezer for a while, but be careful not to leave it in too long or it might explode!

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Helium balloons float because the gas inside the balloon is much less dense than the surrounding atmosphere.

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