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PHY is an abbreviation for the physical layer of the OSI model and refers to the circuitry required to implement physical layer functions. A PHY connects a link layer device (often called MAC as an abbreviation for media access control) to a physical medium such as an optical fiber or copper cable.
pH is the measure of the acidity or alkalinity of a substance. The pH scale runs from 0 to 14 â a lower number means a higher level of acidity (and generally less oxygen) is present, and higher number indicates a higher level of alkalinity.