What is pH value & scale?
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A measure of acidity or alkalinity of water soluble substances (pH stands for 'potential of Hydrogen'). A pH value is a number from 1 to 14, with 7 as the middle (neutral) point. Values below 7 indicate acidity which increases as the number decreases, 1 being the most acidic.
Luqmanuddin:
man PH scale
kya mai samjha nahi
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It determines the thing how is basic or acidic.
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