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==Key Stage 3==

[[File:pHScale.png|right|300px|thumb|A '''pH''' scale with the colours of [[Universal Indicator]] at those '''pH''' values and some examples of [[substance]]s at those '''pH''' values.]]

===Meaning===

~~[[File:pHScale.png|right|300px|thumb|A '''pH''' scale with the colours of [[Universal Indicator]] at those '''pH''' values and some examples of [[substance]]s at those '''pH''' values.]]~~

The '''pH''' scale is a numbered list from 0 to 14 that is used to identify how [[Acid|acidic]] or [[Base|basic]] a [[substance]] is.

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