# Equations Satisfied by a Moving Fluid-Chapter Four

- Publisher
- Elsevier Science & Technology
- Identifiers
- DOI: 10.1016/s0074-6142(08)60029-7

## Abstract

Publisher Summary This chapter examines the fundamental equations for moving fluids, with emphasis on air containing moisture and water containing dissolved salts. It also discusses various types of energy and the use of a rotating frame of reference. When a fluid is in motion, its properties are functions both of spatial position and time t. The concepts of the state of a fluid apply to a particular sample that will move around when the fluid is in motion. Because nearby particles of fluid may move apart in time, it is necessary to consider an infinitesimally small sample that will retain its identity. This is commonly called a “material element of fluid.” As a material element moves, its mass remains constant but its volume may alter. Therefore, its density may change, but it is dependent on the field of motion. The equation relating the rate of change of density to the field of motion is called the “mass conservation equation.”

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