how you explain the last term you just mentioned?
In chemistry, pH is a scale used to specify the acidity or basicity of an aqueous solution.
PH
In chemistry, pH (, denoting 'potential of hydrogen' or 'power of hydrogen') is a scale used to specify the acidity or basicity of an aqueous solution. 
na is the symbol for which of the following chemical elements Sodium what is the historical story of this? In medieval Europe, a compound of sodium with the Latin name of "sodanum" was used as a headache remedy. apart from food, where else is it used? Sodium chloride is extensively used for anti-icing and de-icing and as a preservative. what is the meaning of the second icing method you just mentioned? De-icing is the process of removing snow, ice or frost from a surface. where is it commonly used? Trains, rail switches, aircraft, etc. how is the afore mentioned element used in the transfer of heat? Liquid sodium is used as a heat transfer fluid in some types of nuclear reactors. what role does it play in human biology? In humans, sodium is an essential mineral that regulates blood volume, blood pressure, osmotic equilibrium and pH.
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PH [SEP] Introduction
In chemistry, pH (, denoting 'potential of hydrogen' or 'power of hydrogen') is a scale used to specify the acidity or basicity of an aqueous solution. Acidic solutions (solutions with higher concentrations of H ions) are measured to have lower pH values than basic or alkaline solutions. The pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution. This is because the formula used to calculate pH approximates the negative of the base 10 logarithm of the molar concentration of hydrogen ions in the solution. More precisely, pH is the negative of the base 10 logarithm of the activity of the H ion.