So I was watching X-Men: Days of Future Past. In the prison break scene when Quicksilver deviates all the bullets, he first tastes whatever they were cooking in the kitchen. So it got me thinking, if his relative speed increases that means that the vibration of the particles on the soup (or whatever) become relatively slower. Since heat is strictly related to the vibration of the particles, does this mean that everything becomes colder relative to him?
closed as off-topic by Möoz, Politank-Z, JohnP, Buzz, Ward Apr 24 '18 at 1:48
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You are thinking about this all wrong
When Quicksilver runs, he tastes what they were cooking, not because he is slowing down the air around him, but because his senses are sped-up. Quicksilver can both move and think faster than a standard human being... which is honestly something he would need to be able to avoid death-by-obstacle while running at such high speeds.
Also, when any object moves, it displaces air. Move fast enough, and you will compress a layer of air in-front of yourself, which increases its density, which creates drag and heating and is why people used to think it was impossible to break the sound barrier. It is also why a baseball traveling at 90% C (C is the speed of light) would create a fusion bomb that would vaporize a city. While Quicksilver seems to ignore the effects of this through unstated reasons (possibly just brute-force), the compressed-air layer still contains whatever it had in it. That would concentrate the scent of what was being cooked in the kitchen, making it more noticeable.
So, it is not that Quicksilver cools down the rest of the universe when he is moving (quite the opposite, in-fact). It is, frankly,
mostly almost entirely due to Quicksilver's far-enhanced senses and a tiny-bit due to air compression effects at Mach speed (not to be confused with Mach Effects, which are related to Relativity) that he can smell what they are cooking in the kitchen.