The pixel is often used as a unit of measurement in information technology. Unfortunately, there is not a simple, consistently-applicable answer to what it is a measure of. This report analyzes the pixel unit through the lens of metrology and shows how one entity, the pixel, actually gives rise to a group of different units.
What does the pixel measure?, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.IR.8456, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=935078
(Accessed March 25, 2023)