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Friction  is the  force  resisting the relative motion of two  surfaces  in contact or a surface in contact with a fluid (e.g. air on an air...

Diffraction refers to various phenomena associated with wave propagation, such as the bending, spreading and interference of waves passin...

Viscosity is a measure of the resistance of a fluid to deform under shear stress . It is commonly perceived as "thickness", or r...