The part of a chapter that would better be under the title 'Bullshit'
Introduction:

The convection Heat transfer process can be divided into two broad categories (a) when the flow is generated due to an external forcing agent, such as a fan, pump, natural breeze, forced breeze, generated breeze, motion of a heated object, and (b) when the fluid motion arises simply because of density differences caused by temperature differences in a body force field, such as gravity... zzz... zzz...
by 42 is the answer November 24, 2010

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