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  1. pH - Wikipedia

    In chemistry, pH (/ piːˈheɪtʃ / or / piːˈeɪtʃ /; pee-AYCH) is a logarithmic scale used to specify the acidity or basicity of aqueous solutions. Acidic solutions (solutions with higher concentrations …

  2. PH | Definition, Scale, Uses, Examples, & Facts | Britannica

    Dec 5, 2025 · A pH value is the quantitative measure of the acidity or basicity of aqueous or other liquid solutions. The term, widely used in chemistry, biology, and agronomy, translates the …

  3. What Is pH and What Does It Measure? - ThoughtCo

    Jun 10, 2025 · pH is a measure of how acidic or basic a solution is, from 0 to 14. pH is important for chemical reactions in areas like medicine, cooking, and agriculture. Scientists use pH …

  4. Acids, bases, pH, and buffers - Khan Academy

    Acidity and basicity, proton concentration, the pH scale, and buffers.

  5. What Is pH? - Definition, Uses, Facts - Science Notes and ...

    Aug 2, 2025 · pH measures the concentration of hydrogen ions (H⁺) in a solution and indicates whether a solution is acidic, neutral, or basic. The pH scale typically ranges from 0 to 14, …

  6. What is pH? The pH Formula & Equation - ChemTalk

    This article explains the concept of pH, how to find and calculate the pH, and how the pH formula and pH equation are used in chemistry!

  7. What is pH? - US EPA

    Nov 4, 2025 · What is pH? Acidic and alkaine (or "basic") are two extremes that describe substances, usually liquids or chemicals, just like hot and cold are two extremes that describe …

  8. Understanding the pH Scale: Definitions, Calculations, and ...

    Explore the meaning of pH and how it relates to acidity and basicity. Learn how to calculate pH, pOH, [H₃O⁺], and [OH⁻], and understand what pH tells you about a solution.

  9. PH Definition & Meaning - Merriam-Webster

    Share Kids Definition pH noun (ˈ)pē-ˈāch : a number used in expressing acidity or alkalinity on a scale whose values run from 0 to 14 with 7 representing neutrality, numbers less than 7 …

  10. What Is pH? A Free Explanation of the pH Scale - Biology Insights

    Jul 23, 2025 · pH is a fundamental measurement in chemistry, indicating how acidic or alkaline a substance is. It provides a standardized, numerical value to describe the chemical nature of …