Fart travel time depends on atmospheric conditions such as
humidity, temperature and wind speed and direction, the
molecular weight of the fart particles, and the distance between
the fart transmitter and the fart receiver. Farts also disperse
(spread out) as they leave the source, and their potency
diminishes with dilution. Generally, if the fart is not detected
within a few seconds, it will be too dilute for perception and
will be lost into the atmosphere forever. Exceptional conditions
exist when the fart is released into a small enclosed area such
as an elevator, a small room, or a car. These conditions limit
the amount of dilution possible, and the fart may remain in a
smellable concentration for a long period of time, until it
condenses on the walls.