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• Accidental release source terms [r]: The mathematical equations that estimate the rate at which accidental releases of air pollutants into the atmosphere may occur at industrial facilities. ^[e]
• Air pollutant concentrations [r]: Methods for conversion of air pollutant concentrations. ^[e]
• Antoine equation [r]: A mathematical expression (derived from the Clausius-Clapeyron equation) of the relation between the vapor pressure and the temperature of pure substances. ^[e]
• Bar (unit) [r]: A unit of pressure measurement (symbol: bar) defined as 100,000 Pascals. ^[e]
• Blaise Pascal [r]: French mathematician, physicist, and philosopher. ^[e]
• Boiling point [r]: The temperature at which the vapor pressure of the liquid equals the external environmental pressure surrounding the liquid and the liquid initiates boiling. ^[e]
• Choked flow [r]: A limiting point for the mass flow rate of a gas which occurs under specific conditions when the gas flows through a restriction (such as a valve, a convergent-divergent nozzle, the hole in an orifice plate, or a leak in a gas pipeline or other gas container) into a lower pressure environment. ^[e]
• Factor-label conversion of units [r]: A widely used method for converting one set of dimensional units to another set of equivalent units. ^[e]
• Flue gas stack [r]: A vertical pipe, channel or chimney (also referred to as a smokestack) through which combustion product gases (flue gases) are exhausted to the atmosphere. Includes the draft (draught) effect of hot gases flowing through tall stacks (chimneys). ^[e]
• Gas compressor [r]: A machine that increases the pressure of a gas by reducing its volume. ^[e]
• Gasoline [r]: A fuel for spark-ignited internal combustion engines derived from petroleum crude oil. ^[e]
• Ideal gas law [r]: Relates pressure, volume and temperature for hypothetical gases of atoms or molecules with negligible intermolecular forces. ^[e]
• International System of Units [r]: Metric unit system based on the metre, kilogram, second, ampere, kelvin, mole and candela. ^[e]
• Joule-Thomson effect [r]: The increase or decrease in the temperature of a real gas (as differentiated from an ideal gas) when it is allowed to expand freely at constant enthalpy (meaning that no heat is transferred to or from the gas, and no external work is extracted from the gas). ^[e]
• Mars (planet) [r]: The fourth planet from the Sun in our solar system; named after the Roman god of war; also known as the "Red Planet". ^[e]
• Metre (unit) [r]: Unit of length; one of the seven SI base units. ^[e]
• Molar gas constant [r]: A physical constant which is featured in a large number of fundamental equations in the physical sciences, such as the ideal gas law and the Nernst equation, and it is equivalent to the Boltzmann constant, but expressed in units of energy ^[e]
• National Ambient Air Quality Standards [r]: Concentration limits set by the United States Environmental Protection Agency for outdoor ambient air pollutants considered harmful to public health and the environment. ^[e]
• Pressure [r]: A ratio equal to the force applied perpendicular to the surface of the area divided by that area (force/area). ^[e]
• Reference conditions of gas temperature and pressure [r]: The temperature and pressure conditions that define the density of a gas and serve to document a stated gas volume. ^[e]
• Standard Cubic Feet Per Minute [r]: An acronym for "Standard cubic feet per minute" which is used to denote the volumetric flow rate of a gas (in the United States customary units) corrected to "standardized" conditions of temperature, pressure and relative humidity, thus representing a precise mass flow rate. ^[e]
• Vapor pressure [r]: The pressure of a vapor in equilibrium with its liquid or solid phase. ^[e]