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3. Acidity measures, informally

Alternative clues for the word phs

• Acidity-level symbols
• Light units: Abbr
• Acidity nos
• Litmus test nos
• H.H.S. arm
• Basic ones are above 7
• Chem. class measures
• Acidity levels: Abbr
• Measurements of 60-Acrosses
• Factors in chem class