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OXIDIZING AGENT

Those substances which release oxygen when the temperature goes above a certain point, causing sensitive organic material to ignite. An oxidizing agent can also be referred to as an oxidant. An example can be oxygen.

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OXY-ACETYLENE WELDING

A welding process created with the help of gases. Coalescence occurs when an oxygen flame mixes with acetylene gases when ignited.

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OXYGEN DEMANDING MATERIAL

Decomposed material such as food waste and dead plant/ animal tissue which makes use of oxygen during the decomposition process. It reduces the amount of oxygen in the environment.

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OXYGENATE

Chemicals that are used to raise the oxygen level in a blend of gasoline. This is done to reduce the polluting substances from the exhaust gases and to increase the octane rating.

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OXYGENATED FUEL

Known commonly as oxyfuel, oxygenated fuel is merely a blend of gasoline which contains oxygenates.

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OYER

In old practice. Hearing; the hearing a deed read, which a party sued on a bond, etc., might pray or demand, and it was then read to him by the other party; the entry ou the record being, "et ei legitur in hcco verba," (and it is read to him in these words.) Steph. Pi. 67, 68 ; 3 Bl. Comm. 299; 3 Salk. 119. In modern practice. A copy of a bond or specialty sued upon, given to the opposite party, in lieu of the old practice of reading it.

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OYER AND TERMINER

A half French phrase applied in England to the assizes, which are so called from the commis- sion of oyer and terminer directed to the judges, empowering them to "inquire, hear, and determine" all treasons, felonies, and misdemeanors. This commission is now is- sued regularly, but was formerly used only on particular occasions, as upon sudden out- rage or insurrection in any place. In the United States, the higher criminal courts are called "courts of oyer and terminer." Bur- rill.

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OYER DE RECORD

A petition made in court that the judges, for better proof's sake, will hear or look upon any record. Cowell.

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OYEZ

Hear ye. A word used in courts by the public crier to command attention when a proclamation is about to be made. Commonly corrupted into "O yes." p. 807 PACTA CONVENTA P. An abbreviation for "page;" also for "Paschalis," (Easter term,) iu the Year Books, aud for numerous otiier words of which it is the initial. P. C. An abbreviation for "Pleas of the Crown;" sometimes also for "Privy Council," "Parliamentary Cases," "Patent Cases," "Practice Cases," "Penal Code," or "Political Code." P. H. V. An abbreviation for "pro hac vice," for this turn, for this purpose or occa- sion. P. J. An abbreviation for "president" (or presiding) "judge," (or justice.) P. L. An abbreviation for "Pamphlet Laws" or "Public Laws." P. M. An abbreviation for "postmaster;" also for "post-meridian," afternoon. P. O. An abbreviation of "public officer;" also of "post-office." P. P. An abbreviation for "propria persona," in Ms proper person, in bis own person. P. S. An abbreviation for "Public Statutes ;" also for "postscript"

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OZONE (O3)

Former due to the radiation of solar beams on oxygen in the lower portion of the stratosphere, Ozone is a gas that has a faint blue color. It is an unstable gas that is soluble in water. It is commonly known due to the fact that it covers the earth in a protective layer, which is helpful for reducing the infiltration of ultraviolet rays in to our atmosphere. On the ground, ozone can be formed by a mixture nitrogen oxides and hydrocarbons. Being exposed to ozone for a longer period of time can result in permanent damage to the lungs.

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OZONE DEPLETING SUBSTANCE

Any substance that brings about a reduction in the ozone layer gas in our atmosphere. Generally CFC (chlorofluorocarbons), halon (used in spray cans), certain solvent materials as well as refrigerating material and chlorofluoromethane are common examples. Even thoug most of these are inert, they begin to decompose as they reach up higher in the atmosphere due to the usnlight. This causes damage to the ozone layer, damaging it in the process.

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OZONE DEPLETION

Reduction in the amount of ozone gas layer in the stratosphere. This is usually caused by greenhouse gases, or to be precise, ozone depleting substances.

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OZONE DEPLETION POTENTIAL (ODP)

A relative value that is calculated in comparison to chlorofluorocarbon11, which is referenced with a value of 1. This relative value is used to determine the level of damage that a ubstance can cause to the ozone layer.

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OZONE HOLE

An ozone hole is the significant thinning of the ozone layer at a certain point, exposing a 'hole'.

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OZONE LAYER

A protective covering of ozone gas in the lower levels of the stratosphere. The main purpose of the ozone layer is to prevent ultraviolet rays that emanate from the sun from entering in to our atmosphere. The ozone layer is significantly damaged by ozone depleting substances, such as greenhouses gases, etc.

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