Municipal water supplies are disinfected by treatment either withchlorine or with ozone. one advantage which chlorine has over ozone is thatchlorine treatment kills viruses and ozone does not a..chlorine leaves a taste in the water. b. chlorine treatment converts dissolved organic compounds into chlorinated hydrocarbons. c.chlorine continues to provide protection against microorganisms even after the water leaves the treatment plant.

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Following are the  advantages of the parametric equations: 1) they can be used to graph curves that are not functions, like the unit circle.2) the parameter can be used to represent the quantity that is  useful to  provide us with better information about the graph.3)  it is useful to convert between rectangular equations and parametric equations.with specific reference to chemistry,  parametric equations are employ for solving hydrogen and hydrogen-like ions, quantum mechanically. herein, cartesian coordinates are converted in spherical polar coordinates. the solution obtained, when plotted on spherical polar graph paper, provides visualization of atomic orbital such as s,p,d and f.