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Unformatted text preview: sion principle can be
used to show that the maximum number of electrons permitted in any subshell a
phase A homogeneous portion of matter bounded by is
joined crystals or grains.
surface so that it is mechanically separate from any other
polymer Engineering material compos
high–molecular-weight molecules. These
For a potential energy function with spherical symmetry, as in the case of the hydrogen atom, in which the
phase diagram A graphical representation showing the
negatively charged electron is electrostatically attracted to the positively charged nucleus, the wave equation is
usually have either a linear (chain) struct
solved more easily in spherical r , ,
coordinates. The principal quantum number n is associated with the
phase or phases present for a given composition as a
three-dimensional network structure.
boundary conditions on r ; the angular momentum quantum number l is derived from the boundary conditions
on ; and the magnetic quantum number m is associated with the
coordinate. More detailed quantum
function of temperature.
polymer-matrix composites Composit
calculations show that while n can assume any integer value greater than or equal to 1, the values of the quantum
numbers l and m are restricted as follows: l can only have integer values from 0 to n 1, and m can only assume
phosphorescence Luminescence that persists more
which the matrix material is a polymer.
the integer values from l to l.
than 10 s after the stimulus is removed.
polymorphic Allotropic; capable of m
photoconductivity An increase in electrical
conductivity brought about by photostimulation.
powder metallurgy A process consisti
photolithography AMain Menu thatTextbook Table of Contents
very small particles of metallic powders
| e-Text process | utilizes ultravioletlight–sensitive polymers to etch small devices on an
solidating them in the form of near-net-s
1 v v pg025 [R] elements of interest is heated to temperatures high
particulate composites Composite systems in which
enough reinforcement phase changes of small particles.
to cause chem...
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