define ph scale .. give equation
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Essentially, the definition uses the equation: pH = -log aH+ where aH+ stands for hydrogen activity, which is the effective concentration of hydrogen ions in a solution. This might be slightly different from the true concentration. The IUPAC pH scale also includes thermodynamic factors, which may influence pH.
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Time in physics is defined by its measurement: time is what a clock reads. In classical, non-relativistic physics, it is a scalar quantity (often denoted by the symbol. ) and, like length, mass, and charge, is usually described as a fundamental quantity.
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