Answer:
The best answer to the question: Why does the narrator of the War of the Worlds uses such precise and scientific language? Would be: To add credibility to the story he tells.
Step-by-step explanation:
"The War of the Worlds" is a science fiction novel that was written in 1897 by H.G Wells. The story narrates the events that take place when Earth suffers and invasion by Martians, from the point of view of the narrator of the story, who happens to also be the main protagonist. All we know of this man is that he lives in Surrey, that he becomes a first-hand witness to the horrors of the invasion and the consequences for human beings and Earth in general, and that he has a younger brother, with whom he experiences the events.
Given that the novel is a science fiction one, the language that the narrator uses must show his experience and knowledge of such a field and in order to do that he must use very precise language. This lends the story, and the narrator, credibility and reliability.