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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 the acidity or alkalinity of a substance. The range of pH for most soils. is from 4 to 10 (Figure 1). The pH scale is logarithmic, meaning that a change in one numerical. pH unit equals a 10-fold change in acidity or alkalinity. For example, a soil with a pH of 8 is ten. times more alkaline than a soil with a pH of 7.