What is the difference between the use of transistors and electronic tubes?

When the transistor is ready, it can be sealed directly inside a metal tube or, as is now common, directly inside a lump of plastic. This thing does not need to be burned red to use, and an iron cup is more durable than a glass cup, which is obvious. It is not necessary to keep a vacuum inside the pipe, you can fill it with nitrogen and seal it, or directly plug it with glue. He's better than blue. Electron tube and transistor together, like bear children and good children, a smart but playful, to dad with feather duster guard will seriously to do homework; Although a brain is not very bright at the beginning, but as long as the parents call, they will consciously sit down to learn. Although this is a little strange, but you understand the meaning of good, don't take it seriously. These are the little things about tubes and transistors on the eve of the enlightenment and golden age of electronics. For both, the most important use is actually the same: to amplify electrical signals. The difference is that the working principle is not the same, and the use cost of this difference. If you think this answer is good, please click "like", I will continue to update the computer age in the form of popular science articles.