Comment by GuB-42
5 days ago
A pixel is neither a unit of length nor area, it is like a byte, a unit of information.
Sometimes, it is used as a length or area, omitting a conversion constant, but we do it all the times, the article gives out the mass vs force as an example.
Also worth mentioning that pixels are not always square. For example, the once popular 320x200 resolution have pixels taller than they are wide.
It's not a unit of information. How many bytes does a 320×240 image take? You don't know until you specify the pixel bit depth in bpp (bits per pixel).