Here's why:

* pH scale: The pH scale measures the acidity or alkalinity of a solution. It ranges from 0 to 14, with:

* 0-6 indicating acidic solutions

* 7 indicating a neutral solution

* 8-14 indicating alkaline (basic) solutions

* Strong acids: Strong acids completely ionize (break apart) in water, releasing a large number of hydrogen ions (H+). This results in a very low pH value.

* Weak acids: Weak acids only partially ionize in water, releasing fewer hydrogen ions. This results in a higher pH value than strong acids.

Since a pH of 1 is very low, it indicates a high concentration of H+ ions, making the substance a strong acid.