Story-life at 100 ℃

ice water vapor

A group of students are about to graduate, and the professor has taken them to the lab for the last class. The professor said, "This is the last class I have given you. This is the simplest lab class and the most profound lab class, I hope you will always remember this last lesson. "
The professor took out a glass container, filled it with water, and put it in the freezer. After a while, the water in the container turns into a crystal ice. The professor said,"Below 0 ℃, these water becomes ice, ice is another form of water, but water becomes ice, it cannot flow".
"Now let's look at the 3rd states of water ." The professor said that he had put the ice-filled glass container on an alcohol stove and ignited a raging flame. After a while, the ice gradually melted and then burned, cool to throw a wisp of white water vapor, quietly floating in the laboratory, filled. After a while, the water in the container evaporated and the professor turned off the alcohol stove and asked everyone, "who can tell where the water went ?"

The students stared at the professor. They didn't understand why the knowledgeable professor gave them the simplest experiment.

 

Can you understand the meaning of the professor?