Both the pH scale and the Richter scale are logarithmic. A
decrease of 1 on the pH scale means a tenfold increase in acidity
while an increase of 1 on the Richter scale means a tenfold
increase in intensity.
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The is pH for vomit is 2.
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1
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Vinegar on a pH scale is red. This means that it is a strong
acid and the pH value would be 1/2/3.