- Branche: Education
- Number of terms: 13055
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Founded in 1879 and named after Texas' greatest hero General Sam Houston, Sam Houston State University is public shcool within the Texas state university system and located in Huntsville, Texas.
It's a multicultural institution that offers 79 bachelorette degree programs, 54 masters and five ...
A PCV system is an air pollution control device in automobile engines. PCV stands for positive crankcase ventilation. Automobile makers began installing PCV systems in all new cars in 1963. It helps to recycle hydrocarbon contaminated gases inside the engine (blowby) back into the engine's combustion process.
Industry:Chemistry; Weather
A period of time in either the early or later hours of the day, just before sunrise and after sunset, when the sun is below the horizon but the sky is still illuminated. Beams of light are scattered off of particles in the Earth's atmosphere, causing light to be seen even though the sun is not in the sky. This phenomena happens for a longer period of time in the more northern latitudes; in the far north twilight can lost all night.
Industry:Chemistry; Weather
A phenomenon that can carry energy through space and is created by the vibration of an electrical charge, which is caused by disturbances in electromagnetic fields. Examples of electromagnetic waves include infrared, visible, microwaves, and x-rays. Forms of electromagnetic waves that can be seen by humans we call light.
Industry:Chemistry; Weather
A physical constant used in the simplified ideal gas law equation (PV=nRT). In chemistry, the gas constant is most often represented by the letter R.
Industry:Chemistry; Weather
A plume is a visible smoke-like structure, which may contain pollutants emitted from an exhaust or smoke stack and released into the atmosphere. This elongated band of smoke has changing characteristics that vary with its local environmental conditions. These conditions may include the physical and chemical nature of the pollutant, weather conditions and downwind topography.
Industry:Chemistry; Weather
A pollutant may be considered as any substance, usually an unwanted by-product or waste, that is released into the environment as a result of (human) activities that alter the chemical, physical and biological characteristics of the environment. These substances may be found in any of the solid, liquid or gas phases. Their long-term effects are difficult to predict and depend upon future human or cultural judgments.
Industry:Chemistry; Weather
A prescribed level of atmospheric pollution allowed for a certain compound during a specific time in a specific geographical area. Standards are set by some regulating body, office or agency.
Industry:Chemistry; Weather
A process by which atmospheric particles collide and stick to each other forming a new particle. Many of the particles emitted from automobile tailpipes are agglomerations of smaller particles formed in the combustion process.
Industry:Chemistry; Weather
A process in which water condenses on a small atmospheric particle. Nucleation aides in the process of condensation (see methanesulfonic acid).
Industry:Chemistry; Weather
