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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 a measure of acidity or alkalinity of a solution. The level of acidity or alkalinity of a solution is expressed as a number from 1 to 14 on the pH scale. The lower the pH number, the more acidic the solution is. The higher a pH number, the more alkaline (or basic) the solution is.