Click a number or a household item to learn what its pH means.
pH is a scale from 0 to 14 that measures how acidic or basic a liquid is. It stands for "power of Hydrogen" — it tells us the concentration of hydrogen ions (H⁺) in a solution.
The formula:
pH = −log₁₀[H⁺]That means:
Fun fact: Your stomach acid has a pH of about 1.5–3.5 — strong enough to dissolve metal!