- 産業: Education
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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 ...
The destruction of a molecule by electromagnetic radiation, which provides the energy required for a constituent atom to break the chemical bonds between it and the other atoms comprising the molecule.
Industry:Chemistry; Weather
The downward pressure, at any given point in the atmosphere, of the gases directly above that point. Average pressure globally at sea level is 1,013,000 dynes per centimeter squared or 760 torr. This is defined as one atmosphere.
Industry:Chemistry; Weather
The efficiency of a body's ability to absorb and reemit radiation compared to the emissivity of a blackbody at the same temperature. Emissivity ranges from 0 to 1, with one being a blackbody and less than 1 for all other materials. All bodies with a temperature above 0 K emit radiation.
Industry:Chemistry; Weather
The element that underwent radioactive decay to produce a radioactive isotope and eventually produce a more stable product. This decay can be by the emission of an alpha particle, two protons and two neutrons, or by the emission of a beta particle, emission of an electron which changes a neutron to a proton. This is used in the dating of objects because the decay happens in a predictable known pattern.
Industry:Chemistry; Weather
The energy barrier that must be overcome during a collision of two potential reactants in order for a reaction to occur.
Industry:Chemistry; Weather
The exchange between the stratosphere and the troposphere is extremely important. It is caused by upwelling in the troposphere and when troposphere species are pushed into the stratosphere. It starts in the tropics and moves toward the poles. If certain ozone destroying species are brought into the stratosphere from the troposphere when they mix damage to the ozone layer and global warming can result.
Industry:Chemistry; Weather
The exchange of gaseous components of the atmosphere in a turbulent flow by rapid mixing of fluid eddies.
Industry:Chemistry; Weather
The first national act in the United States to regulate emissions into the atmosphere; the act was closely related to a previous act created in 1963. The bill was created in response to growing urban areas that were having obvious pollution problems.
Industry:Chemistry; Weather
The fixed proportions in which two or more substances may become combined, such as the amount of nitrogen in the air compared to the rest of the air. Atmospheric scientists routinely discuss the gas phase concentrations of trace components in mixing ratios expressed in ratios of VOLUMES, as in "the present tropospheric mixing ratio for methane is approximately 1. 7 ppmv. "
Industry:Chemistry; Weather
The gases in earth's atmosphere whose concentrations are considered stable or invariable. This includes gases such as O<sub>2</sub>, N<sub>2</sub>, and the noble gases, as opposed to variable gases such as CH<sub>4</sub> and CO<sub>2</sub> whose concentrations change because of reactivity or because there are large atmospheric sinks such as vegetation in the case of CO<sub>2</sub>.
Industry:Chemistry; Weather
