Appendix C 
What Is a Pixel?
Pixel Size
The easiest way to confuse beginning digital photographers would be to ask them with a straight face, “What size is a pixel?”
The reason this is a trick question is that the size of a “pixel” entirely depends on the kind of pixel it happens to be. This is why the definitions of pixels and resolution can be so confusing.
The word “resolution” refers to the number of pixels there are per inch of a given imaging media.
In terms of size, pixels come in two different types: fixed hardware pixels and variable image pixels.
Screen Pixels
On the surface of a computer monitor, a pixel is a fixed and rigid physical ...
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