About the fluids

Fluids are continuous , deformable objects. A fluid may be considered as a state of matter , which comprises the plasma fluid and to a certain extent , the deformable solid bodies , provided that it is considered large enough quantities of the substance to be administered may approximation of a continuous medium ( atomistic nature a matter to be ignored ) . Liquids , unlike other fluid having a free surface ( a surface which is not defined by the container in which the fluid is located ) . The difference between solids and fluids is not obvious. For small time intervals, the glass can be seen as a solid body , and for larger : as a liquid . This is because glass has a high viscosity. Ideal fluid is one whose viscosity is zero (ie no internal friction , which is defined as the friction between layers of fluid ) . The property of the fluid to flow is determined by the fact that they can not remain in static equilibrium in an uneven application of pressure. Fluids are divided into two types: Newtonian fluid : fluid in which the voltage is directly proportional to the rate of shrinkage Non-Newtonian fluid : fluid in which the voltage is proportional to the degree and rate of contraction derived The behavior of fluids described by partial differential equations that express the conservation of mass , momentum , angular momentum ( Navier -Stokes ) and energy. Read more: Energy Needs