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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.
Generally, pH is the measurement given to determining the acidity and alkalinity of the body. pH is the most basic and fundamental driving force of all our body functions. The pH range goes from 1-14, where 1 is highly acidic and 14 is highly alkaline.