Which characteristic is NOT a physical characteristic of water?

The characteristic that is not a physical characteristic of water is pH. pH is a measure of how acidic or basic a substance is and is considered a chemical property rather than a physical one. Physical characteristics of water include turbidity, temperature, and color, which can be observed or measured without altering the substance's chemical structure.

Turbidity refers to the cloudiness or haziness of water caused by suspended particles. Temperature affects the state of water and influences chemical reactions. Color can indicate the presence of different substances in the water. While pH is crucial for understanding water quality and its suitability for various uses, it does not fit into the category of physical characteristics because it involves the chemical interactions of water with ions.