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...Lecture notes on fluid mechanics prepared by dr subasini jena lecturer in chemical engg ugie rourkela definition of a is substance which deforms continuously or flows when subjected to external shearing forces under the action shear stress both liquids and gases are termed as fluids yes flow condition so at that time will be present rest there any no if force acting it all must perpendicular plane they motion stresses developed due particles moving relative another example flowing pipe line for velocity zero wall increase while towards centre maximum normally because adjacent layer move with different velocities compared each other characteristics liquid gas has definite shape its own but conforms containing vessel even small amount exerted cause undergo deformation continues long applied note solid suffers strain whereas rate i e similar circumstances statics dynamics where pressure considered kinematics not branch science deals behaviour consists study called properties density mass ...