what is acidic rain? how the pH of soil can be measured?
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The rain from these clouds then falls as very weak acid - which is why it is known as "acid rain". Acidity is measured using a scale called the pH scale. This scale goes from 0 to 14. ... When the air becomes more polluted with nitrogen oxides and sulphur dioxide the acidity can increase to a pH value of 4
ashishdutta:
tq
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