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Gases and suspensions are viewed as an aggregate of
'flying particles'. The velocity of each particle is the microscopic
expression of its 'temperature'. The particles collide with each
other, and with the boundaries that contain the fluid.
These collisions are the mechanism for momentum transfer
The large number of particles justifies certain statistical assumptions
which lead to statistical equations, which in turn are used to predict
fluid behavior under a set of influencing forces, and temperature
gradients.
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