Ray Bradbury uses lots of figurative language in Fahrenheit 451! Some examples include similes, metaphors, idioms, and personification.
A simile is a comparison using the words "like" or "as":
Their covers were torn off and spilled out like swan feathers.
This simile helps us visualize the destruction of the books.
The books leapt and danced like roasted birds, their wings ablaze with red and yellow feathers.
Again, we are able to imagine the fire set to the books because of the comparison Bradbury uses. This quote also features personification, as the books are not actually dancing, but by giving them a human motion, we can imagine what the movement looked like in the fire.
Personification is also used in the following quote:
The night looking at him. The forest, seeing him.
A metaphor also makes a comparison, but "like" and "as" are not used:
Montag stood with the flame thrower in his limp hands, great islands of perspiration drenching his armpits, his face smeared with soot.
Bradbury compares Montag's sweat to islands to emphasize how hot it is.
The last rolling thunder of the avalanche stoned down about his ears.
This metaphor evokes our senses to help us imagine how loud it is.
An idiom is a common phrase or expression. For example, "I've hit the bullseye" is an expression Bradbury uses in the text. We are familiar with this phrase, and know what it means colloquially.
Scientists give us gobbledegook about friction and molecules.
This is another example. We know "gobbledegook" means unintelligible jargon.