Declaring Python variables. There are two phases of creating a variable: 1  First, you need to initialize a variable by creating a container and assign it a name. 2  This is called initialization. 3  Second, you assign value to the the variable. 4  This is known as assignment.
Cylindricity-Cylindricity describes a condition of a surface of revolution in which all points of a surface are equidistant from a common axis. Symbol: . Cylindricity controls a cylindricals features element such that the total variations are minimized during manufacturing.
Permittivity is analogous to magnetic permeability, and it specifies the ease with which electric flux is permitted to pass through a given dielectric material. The permittivity of a material is the ratio of the electric flux density to the electric field strength in that material. The permittivity of a material is a measure of how easily electric lines of force can pass through it. 1  Permittivity is analogous to magnetic permeability, and it specifies the ease with which electric flux is permitted to pass through a given dielectric material.