Accidental release source terms are the mathematical equations that quantify the flow rate at which accidental releases of air pollutants into the ambient environment can occur at industrial facilities such as petroleum refineries, petrochemical plants, natural gas processing plants, oil and gas transportation pipelines, chemical plants, and many other industrial activities. Governmental regulations in many countries require that the probability of such accidental releases be analyzed and their quantitative impact upon the environment and human health be determined so that mitigating steps can be planned and implemented.
There are a number of mathematical calculation methods for determining the flow rate at which gaseous and liquid pollutants might be released from various types of accidents. Such calculational methods are referred to as source terms, and this article on accidental release source terms explains some of the calculation methods used for determining the mass flow rate at which gaseous pollutants may be accidentally released.
Read more about Accidental Release Source Terms: Accidental Release of Pressurized Gas, Evaporation of Non-boiling Liquid Pool, Evaporation of Boiling Cold Liquid Pool, Adiabatic Flash of Liquified Gas Release
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... where X = weight percent vaporized HsL = source liquid enthalpy at source temperature and pressure, J/kg HaV = flashed vapor enthalpy at atmospheric boiling point ...
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