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The pH scale. Soil pH is used to indicate the acidity (or alkalinity) of soil, and is a measure of the concentration of hydrogen ions (H+) in the soil solution. pH is measured from 1 (acidic) to 14 (alkaline), with 7 being neutral and is measured on a negative logarithmic scale (base 10). The lower the pH, the higher the acidity (Figure 1).

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The pH scale is used to determine how acidic or alkaline different solutions are. The scale goes from 0 to 14. Right in the middle is 7, considered to be neutral. Anything below 7 is acidic. And anything above 7 is considered alkaline. Dish soap comes closest to being a neutral cleaner. Why does this matter?

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Neutral Earthing Resistors (NERs) are used in an AC distribution networks to limit transient overvoltages that flow through the neutral point of a transformer or generator to a safe value during a fault event such as a phase to phase, phase to neutral or phase to earth fault.

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