What does pH measure?

pH measures the acidity or alkalinity of a solution on a scale that typically ranges from 0 to 14. A pH value of 7 is considered neutral, while values below 7 indicate acidity and values above 7 indicate alkalinity. The pH level is essential in various biological and chemical processes, influencing enzyme activity, metabolic reactions, and the overall balance of bodily fluids. Understanding pH is crucial in fields such as medicine, biology, and environmental science, where the pH of various solutions can impact health, ecosystem dynamics, and chemical reactions. While concepts like body temperature, heart rate variability, and energy expenditure are significant in physical education and health, they do not relate to measuring pH levels.