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Gas
氣體
There are three different kinds of matter. They are solids, liquids and gases.
物質分三種：固體、液體和氣體。
Gas has no shape, so you can't touch gas.
氣體本無形，所以你觸摸不到。
Gas moves very freely.
氣體能非常自由地運動。
Gas can change into a solid or a liquid when the temperature gets too low.
當溫度變得很低時，氣體就能變成固體或液體。
On the other hand, a solid can change into gas when the temperature gets too high.
反之，當溫度變得很高時，固體或液體就能變成氣體。
Is there a good example of these changes?
有沒有這些變化的好例子？
Of course, it is dry ice.
當然有，它就是干冰。
