Gas
气体
There are three different kinds of matter. They are solids, liquids and gases.
物质分三种:固体、液体和气体。
Gas has no shape, so you can't touch gas.
气体本无形,所以你触摸不到。
Gas moves very freely.
气体能非常自由地运动。
Gas can change into a solid or a liquid when the temperature gets too low.
当温度变得很低时,气体就能变成固体或液体。
On the other hand, a solid can change into gas when the temperature gets too high.
反之,当温度变得很高时,固体或液体就能变成气体。
Is there a good example of these changes?
有没有这些变化的好例子?
Of course, it is dry ice.
当然有,它就是干冰。