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 of hydrogen (H+) …
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 values of the …
What Is pH? - Definition, Uses, Facts - Science Notes and Projects
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, where 7 is neutral, …
What is pH? The pH Formula & Equation - ChemTalk
The formula for pH is shown above. pH is defined as the negative log base 10 of the hydronium concentration. The pH is a logarithmic measure of the concentration of hydrogen ions in a solution.
What is pH? - US EPA
Nov 4, 2025 · Each whole pH value is ten times stronger than the next outer or more extreme value. For example, a pH of 4 is ten times more acidic than a pH of 5. A pH of 9 is ten times more alkaline (or …
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 meters and …
What Does pH Stand For and What Is the pH Scale?
4 days ago · The pH value offers a standardized way to compare solutions, whether analyzing soil conditions, formulating medications, or studying the human body. The Definition of pH The term pH …
Understanding the pH Scale: Definitions, Calculations, and Concepts
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.
pH Scale: Definition, Chart, Values, & Range - Chemistry Learner
pH is a scale used to measure the acidity or basicity of a solution. It ranges from 0 to 14 and reflects the relative concentration of hydrogen ions (H⁺) and hydroxide ions (OH⁻) in aqueous solutions.
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 increasing acidity, …