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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.
The scientific term pH is an abbreviation that stands for potential of hydrogen, which is a measure of the acidity or alkalinity of a solution.The term, which first came into use in 1909, is Germanic in origin and is derived from the word potenz, meaning power, plus H, which is the symbol for hydrogen on the periodic table. Keep Learning.