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Index (O)

OA - OC

OD - OF

OG - OJ

OK - ON

OO - OR

OS - OV

OW - OZ

Moment of truth
The fastest man-made object that ever leave the Earth is the New Horizon spacecraft, launched in January 2006, and attained a speed of more than 36000 mph.


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oleum Chem.
A commercial name for fuming sulfuric acid, formed by dissolving sulfur trioxide (SO3) in sulfuric acid (H2SO4). It is graded according to percentage weight of dissolved sulfur trioxide. For example, oleum 24% contain 24% of free SO3 in 100% H2SO4. It has a chemical symbol H2SO4.xSO3 and is used in the production of sulfonamides, fatty alcohol sulfates and amidosulfonic acids.

oncogene Biol.
A gene that is capable of causing the transformation of normal cells into cancer cells, by producing abnormal protein. This results in uncontrol cell division leading to the formation of cancerous tumors.

onium ion Chem.
An ion formed by adding a proton to a neutral molecular group. For example, in dissociation of acids, the addition of proton, (H+), to neutral water molecules to give hydroxonium ion, H3O+. Other examples of onium ions are ammonium (H4N+), phosphonium (H4P+) and sulfonium (H3S+).

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