ABSTRACT
Air is a mixture of gases that constitutes the Earth's atmosphere. A gas power system may function as part of a process, such as heating and cooling, or it may be used as a secondary service system, such as compressed air. In dispersion, air pollutants are diluted and reduced in concentration. Air pollution dispersion mechanisms are a function of the prevailing meteorological conditions. To understand the physics of air it is imperative to have an understanding of various physical laws that govern the behavior of pressurized gases. Gases of interest in air pollution control are usually mixtures of several different compounds; air is composed of three major constituents: nitrogen (N2) at approximately 78.1", oxygen (O2) at approximately 20.9", and argon at 0.9". Gas velocity is one of the fundamental design variables for ventilation systems and air pollution control equipment. Gas density affects the velocities of gas through ductwork and air pollution control equipment.
