The Science of Living Things series demonstrates that Bobbie Kalman and her staff have turned out yet another informative and finely produced series of books. . . . this whole series would make a welcome addition to the elementary school library -- Kay Lehr, Fort Rouge School, Manitoba, Jan. 1999.
perpendicularity - the quality of being at right angles to a given line or plane (especially the plane of the horizon) oblongness, rectangularity - the property of being shaped like a rectangle.
Viscosity is defined as the resistance of a fluid to deformation under shear stress. It is generally considered as flow behavior or resistance to pouring. Viscosity is described as the internal resistance of a fluid to flow and may be considered as a measure of fluid friction. Viscosity is an important parameter in the paint industry processing stage. Figure 1.