Complete the statements by writing the number from the graph. 1. The substance is in the gas phase only in region _
.
2. The substance is in both the liquid and the solid phase in region _
.
3. The substance is in only the liquid phase in region _
.
4. The melting point is the temperature at region _
.
5. The boiling point is the temperature at region _

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.