Fluid dynamics It has several subdisciplines itself, including aerodynamics (the study of air and other gases in motion) and hydrodynamics (the study of liquids in motion).

Fluid mechanics is difficult indeed. The primary reason is there seems to be more exceptions than rules. This subject evolves from observing behaviour of fluids and trying to put them in the context of mathematical formulation. Many phenomena are still not accurately explained.

Fluid helps to protect and cushion joints and organs. Fluid helps to prevent dehydration. Dehydration causes headaches, fatigue, confusion and irritability. Fluid helps your kidneys work to produce urine and remove waste from the body.

The Different Types of Fluid Flow

• Fluid evenness: Steady or unsteady flow. Fluid flow can be steady or unsteady, depending on the fluid’s velocity:
• Fluid squeezability: Compressible or incompressible flow.
• Fluid thickness: Viscous or nonviscous flow.
• Fluid spinning: Rotational or irrotational flow.

The basic fluid mechanics principles are the continuity equation (i.e. conservation of mass), the momentum principle (or conservation of momentum) and the energy equation. A related principle is the Bernoulli equation which derives from the motion equation (e.g. Section 2.2. 3, and Liggett (1993)).

Liquids, solids, and gases. Liquids flow because the intermolecular forces between molecules are weak enough to allow the molecules to move around relative to one another. In liquids, the intermolecular forces can shift between molecules and allow them to move past one another and flow.

liquid particles are not packed as tightly as in the case of solids,nor these are as free as the particles in the gaseous form so this makes liquid easier to pour(the average packing of the particles).

All liquids show the following characteristics:

• Liquids are almost incompressible. In liquids molecules are pretty close to each other.
• Liquids have fixed volume but no fixed shape.
• Liquids flow from higher to lower level.
• Liquids have their boiling points above room temperature, under normal conditions.

The option (D) is not a property of the liquid state. A liquid boils at lower temperature at the top of a mountain than at the sea level. This is because the pressure at the top of a mountain is lower than that at the sea level. This lowers the boiling point of the liquid.

There are three physical properties of fluids that are particularly important: density, viscosity, and surface tension.

Fluid Properties (three types) Kinematic properties – properties related to fluid motion, like velocity and acceleration. Thermodynamic properties – properties which describe the thermodynamic state of a fluid. These include temperature, pressure, density, internal energy, specific entropy, specific enthalpy, etc.

The pressure in a liquid does not depend on the shape or size of the container. The pressure in a liquid acts in all directions. Pressure exerted increase with depth of liquid. Pressure at all points at equal depth is equal.

The fluid is a substance which is having a tendency to flow. The properties of fluid include Density or Mass Density, Weight Density or Specific Weight, Specific Volume, Specific Gravity, and Viscosity.

The properties include the density, compressibility, and viscosity.