If a bottle of ether is opened at one end of a room, we can soon smell the vapors at the other end. But the ether molecules have not traversed the room in a straight line, nor in a single bound. They have undergone myriad collisions with air molecules, bouncing first one way, then another in a random walk that takes some molecules back into the bottle from which they came, others through a crack in the door, and yet others into the vicinity of an observer’s nose where they can be inhaled to give the sensation of smell.
KeywordsRandom Walk Internal Energy Random Process Phase Cell Scale Height
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