2.2. Analytical Basis. The analysis of any fluid system must
take into consideration one or more of the following:
1. Conservation of mass.
2. Conservation of energy.
3. Newton's laws of ruction.
a. Every body continues in a state of rest or of uniform motion in a straight line unless compelled by force to change that state.
b. The rate of change of momentum is proportional to the force applied and takes place in the direction of the force application.
c. To every action tllere is always an equal and opposite reaction. The term fluid system. as herein considered refers to any part of a building or unit or series of units of equipment which is related to fluid mechanics. It may be a complete system such as a water or ventilating system for a processing plant or a single unit such as a valve, filter, pump, or a length of pipe. It must have definite boundaries. Consider Fig. 2.1. This hydraulic system consists of a pump, filter, valve, elbow, and connecting